App Overview

Gradius0 icon

Gradius0

Ivan Cerra de Castro · Entertainment

G R A D I U S Z E R O

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
1.7
6 ratings · Below Average

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's included15 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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Gradius0: map the core Entertainment 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

Focus on a bug-free experience and gather user feedback for improvements.

Assumption to check: Poor user ratings and reviews often indicate bugs or usability issues.

Validate with people who use this workflow before building.

Hypothesis 2

Implement advanced search and recommendation algorithms.

Assumption to check: Limited content discovery features may frustrate users.

Validate with people who use this workflow before building.

Hypothesis 3

Use a more subtle approach to monetize features without disrupting user experience.

Assumption to check: In-app purchase prompts can be intrusive.

Validate with people who use this workflow before building.

Hypothesis 4

Incorporate robust offline download capabilities for media.

Assumption to check: Lack of offline viewing options can limit usability.

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

G R A D I U S Z E R O --------------------------- Controls: ------------ Left hand Hold and Slide - Control a virtual Joystick to ship moves. Right hand tap - Fire Missile and Bombs. Instructions: -------------- Player controls a ship that must infiltrate the five levels of the Scramble system and destroy the Base in the sixth. Level 1.- Has the player over a decidedly hilly terrain. Player must dodge or destroy enemy missiles shot from the ground. Level 2.- Is inside a cavern. The quarters are not tight, but the swarms of enemy saucers make maneuvering difficult at best. Level 3.- The player exits the cavern and is assaulted by a storm of fireballsl. The fireballs are fast and indestructible and must be manically dodged. Level 4.- Flies the player over a large metropolis. Missiles fired at the player from the tops of buildings again become a threat. Level 5.- Sends the player into obnoxiously tight machine tunnels. Pilot error is the only though formidable enemy. The final level has the player make an attack run on the Base, defended only by its position in a deep valley. After the destruction of the Base, the player begins again.

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
Supabase
axios
react-navigation
expo-av
BUILD KIT DIFFICULTY
Intermediate

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.