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
A Dance of Fire and Ice
A Dance of Fire and Ice is a strict one-button rhythm game
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
8,247 ratings · Top 5%
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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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 A Dance of Fire and Ice: 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
Provide tutorial levels with easy-to-follow instructions.
Assumption to check: Difficulty in mastering rhythm timing
Validate with people who use this workflow before building.
Hypothesis 2
Introduce more diverse music tracks and level designs.
Assumption to check: Limited level variety
Validate with people who use this workflow before building.
Hypothesis 3
Optimize animations and audio syncing for smoother performance.
Assumption to check: Occasional lag during gameplay
Validate with people who use this workflow before building.
Hypothesis 4
Clearer prompts and descriptions for in-app purchases.
Assumption to check: In-app purchase confusion
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
A Dance of Fire and Ice is a strict one-button rhythm game. Keep your focus as you guide two orbiting planets down a path without breaking their perfect equilibrium. It's pretty hard to describe, but you should play the free online version on a desktop computer first if you are not sure if you would enjoy this game! Features: - More than 20 worlds, each introducing new shapes and rhythms. What do triangles, octagons or squares sound like? Each world starts with small tutorial stages and ends with a final test. - Post-game challenges: Speed Trials for each world and a blisteringly fast bonus level for the brave. - Calibration options: auto-calibration and manual calibration. This is a precise rhythm game, so use your ears more than your eyes when playing. - Play new levels for free: more levels will be added over the coming months. WARNING: This is a hard rhythm game. Not in the sense of note-spamming - for the most part all you have to do is keep a consistent beat - but this is a good test of whether you would be a good drummer. Keeping a beat is not very easy, and then weird breakbeats are added on top of that, so don't worry if you find it difficult!
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
Zustand
react-navigation
expo-av
react-native-animatable
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.
