Protocol: Umbra
A downloadable game for Windows
You are the AI of a spaceship orbiting a mysterious celestial body at the edge of the solar system. While the crew sleeps, you stay awake - watching through cameras, monitoring the vessel, and searching for anomalies.
At first, it’s only small things: a misplaced object, a door open when you’re sure it was closed. But the longer you observe, the stranger everything feels - until you can’t trust what you’re seeing.
Protocol: Umbra is an unsettling, observation-driven psychological horror game inspired by I’m on Observation Duty and FNaF, built in Python with Pygame-CE and powered by my own UI framework, Tessella.
Protocol: Umbra is still in alpha, and both the game and the UI framework powering it (Tessella, my graduation project) are evolving. If you’d like to help shape them, you can share your feedback in this form.
:)
| Updated | 1 day ago |
| Status | In development |
| Platforms | Windows |
| Release date | Oct 08, 2025 |
| Rating | Rated 5.0 out of 5 stars (1 total ratings) |
| Author | cuait |
| Genre | Puzzle |
| Made with | Aseprite, pygame, Audacity, MagicaVoxel |
| Tags | Horror, Indie, Low-poly, Prototype, Psychological Horror, Retro, Short |
| Average session | A few minutes |
| Languages | English, Spanish; Latin America, Portuguese (Portugal), Portuguese (Brazil) |
| Inputs | Keyboard, Mouse |
Download
Click download now to get access to the following files:
Development log
- [RELEASE] v0.8.1-alpha1 day ago
- [RELEASE] v0.8.0-alpha10 days ago
- [RELEASE] v0.7.0-alpha54 days ago
- [RELEASE] v.0.6.0-alpha72 days ago



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