Really nice concpet. I'd love to see multiplayer version of this. When I played for some weird reason doors were invisible, and It made the gameplay harder and more frustrating. You could also improve art for the environment.
Nice concept. I really love the artwork and the audio. However, if you always go through the left exit, you just win. You should add some corridors without an anomaly, or maybe I just got unlucky twice. Cool game tho!
You need to first collect stones and then press keys from 1 to 4. If you die before reaching the checkpoint, you need to collect the stone again. In the right corner, you can see which ones you have unlocked.
Nice cute idea! Pixel art is cute too, but I'd add some background not a single color, and next time export to html instead to windows, because you will get more ratings. Not everyone wants to download game because it could be a virus.