Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Human: Fall Flat
Human Fall Flat is a hilarious, light-hearted physics platformer set in floating dreamscapes that can be played solo or with up to 4 players
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
3,099 ratings · Top 30%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Human: Fall Flat: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce new challenges and level designs frequently.
Assumption to check: Levels can become repetitive and lack variety.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize network performance and reduce latency.
Assumption to check: Multiplayer experience can be laggy.
Validate with people who use this workflow before building.
Hypothesis 3
Add more skins, outfits, and accessories.
Assumption to check: Limited customization options for characters.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer value for in-app purchases and offer more free content.
Assumption to check: In-app purchases can feel intrusive.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Human Fall Flat is a hilarious, light-hearted physics platformer set in floating dreamscapes that can be played solo or with up to 4 players. Free new levels keep its vibrant community rewarded. Each dream level provides a new environment to navigate, from mansions, castles and Aztec adventures to snowy mountains, eerie nightscapes and industrial locations. Multiple routes through each level, and perfectly playful puzzles ensure exploration and ingenuity are rewarded. MORE HUMANS, MORE MAYHEM - Need a hand getting that boulder on to a catapult, or need someone to break that wall? Online multiplayer for up to 4 players transforms the way Human Fall Flat is played. MIND BENDING PUZZLES - Explore open-ended levels full of challenging puzzles and hilarious distractions. Try new paths and discover all the secrets! A BLANK CANVAS - Your Human is yours to customize. With outfits from builder to chef, skydiver, miner, astronaut and ninja. Choose your head, upper and lower body and get creative with the colors! FREE GREAT CONTENT - Since launch more than four brand new levels have launched free of charge with even more on the horizon. What could the next dreamscape have in store? A VIBRANT COMMUNITY - Streamers and YouTubers flock to Human Fall Flat for its unique, hilarious gameplay. Fans have watched these videos more than 3 Billion times!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
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expo-three
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zustand
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
