A short dungeon crawler with clear design intent and goals. A tutorial about the usage of blue potion (key), and the condition of red room (collapsing room) to appear would help with the learning curve for players who aren't familiar with this genre.
There is no audio, and buttons are delay in menu screen. Also leaving a room without clearing enemies will cause them to enter attacking intent loop (the red slime), and their attack sounds will extent forever until you come back and clear them.
Overall, still a great dungeon crawler/action entry!