おんねんちゃんねる大冒険
An endless vertical-scrolling shooter about chasing exponentially growing scores; the credits list all of the coding as done by Claude Code.
Links go to the official store or developer page. Last verified Nov 3, 2026.
Where to play
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Download from Freem! (Windows).
Desktop · ふりーむ! (Freem!)
About おんねんちゃんねる大冒険
A free vertical-scrolling 2D shoot-'em-up for Windows built around high scores that grow exponentially. Enemies drop items that power up your ship: level-ups (up to level 12, with the cap rising as you clear stages), a 10% HP refill, clones that fire very fast and last 20 seconds unless you keep collecting more (up to two at once), bombs that wipe enemies and their bullets off the screen, and, from bosses only, a higher maximum HP. The score multiplier grows by one with every stage, rises with your combo (taking damage cuts the combo by 30%) and with bombing many enemies at once, and each stage has one bonus enemy that pays best when bombed. Stages go on without end and get harder as you go. The page puts a session at 30 minutes to an hour; gamepads are supported. The characters, おんねん and a cast that includes a succubus, a mummy, a werewolf, Dracula, a witch and an angel, are voiced by 14 credited cast members. The credits list the coding as Claude Code (AI) and say that only the coding was made by AI; the design of おんねん is credited to a named designer (黒杉くろん). The page gives the development time as two weeks.
How it was built
Partially verifiedThe credits on the Freem! page list the coding as “Claude Code（AI）”, and the tools section names Claude Code and adds that only the coding was made by AI. The design of おんねん is credited to a person and the voices to a credited cast. The page does not describe how the developers worked with Claude Code.
Coding by Claude Code, everything else by people, per the credits: the design of おんねん is by 黒杉くろん, other work is credited to おんねん, and 14 cast members voice the characters. The page gives the development period as two weeks. No devlog was found.
- Engine / framework
- Not disclosed
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- 2 weeksDeveloper Reportedふりーむ! (Freem!)
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
Verification notes: The AI claim comes from the credits and tools section on the game's Freem! page, which list the coding as Claude Code and say only the coding was AI-made (“コーディングのみ、AIの制作となります”). No other source was found: the creator page links no website or social account. The credits name several people, so the developer is recorded as a team, but no head count is given and team size is not recorded. Development time (2週間) is from the page. Registered on Freem! on 28 May 2026 (version 1.00) and not updated since. The OS field lists Windows 10/11 and Browser, but the page offers only a Windows download, so only desktop is recorded. The game's mechanics are a score-attack shmup with endless stages; it is not tagged as an endless runner. Who the characters are beyond the cast list is not explained on the page. The game was not run, and nothing on the page mentions AI running during play. Freem! shows no reviews.
Development history
Published on Freem! as a free Windows download (version 1.00).
Officialふりーむ! (Freem!)
Game performance
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Freem!
Free Windows download (Windows 10/11 64-bit, version 1.00, about 299 MB). The page's OS field also lists Browser, but only a Windows download is offered.
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Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| おんねんちゃんねる大冒険 (ふりーむ!) ふりーむ! (Freem!) · Japanese | Store page | May 28, 2026 | Nov 3, 2026 |
| おんねんちゃんねる — Freem! creator page ふりーむ! (Freem!) · Japanese | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) おんねんちゃんねる | Official site | Not confirmed | Nov 3, 2026 |
