Awesome Idea and nicely executed. Bonus points for successfully using the 3 color limitation with 3D in such a clean and useful manner and for the entertaining creature sounds :D
The voice was a bit to difficult to understand, but it also gave some air of strangeness to the whole thing. Also when the voice told me to press x on my keyboard to go to the level it did not work for me.

Really cool concept, especially managing to pull off a 3D game with 3 colors. It was a little hard to understand what the voice was saying as well as feel my way around with the unpaintable walls. I did also find some weird section with a black cube that violated the 3-color rule. Very unique and looks like a game you could definitely continue and expand upon.

EDIT: Would also have liked a crosshair so it's easier to aim. Also the game doesn't capture the mouse so if windowed/second monitor u can accidentally click out of the game.

Nice use of  the limitation in this 3 color world ! It's fun to paint walls ! And I love the electronic voice for the instructions ! Nice 3D game ! Congrats !