I liked this game! I was even frightened a bit. You did a good job on creating atmosphere! I know it wasn't supposed to be a horror, but still to be frightening - and it worked with all these SFX, corridors, darkness and music.
A few things I want to point out:
- I see that the door from which you escape has two golden keyholes, but I could escape with only one golden key and the other one made of copper. Is it a bug or just one golden key was intended?
- Mutate mode is an interesting idea, but it is unclear what it is used for besides getting temporarily quicker, seeing in the dark and being invulnerable.
- Maybe I've encountered a bug, but my system cursor was not hidden.
I also liked the effect you put on brick texture, it adds dept into them without manually making it an actual 3D texture that would suck all my GPU memory.
Overall, you did a great job on working on this project. If there was more content and some story, it could even grow into a real game I'd play with much interest!