Ohh.. mysterious noir mouse is soo cool.
Look and style were awesome!
Juuust needs a win condition at the very end, and some more collisions, and something to guide the player forwards at the start in case they go in the wrong dir, but otherwise looks frickin awesome - Love it!
Soo close, like it's long enough.. just a light that comes on when you go in your hole at the end and then a fade to black with a message would be enough. That would wrap it up and make it feel as a conclusive experience (even if it's short and lacking other objectives). It still looks lovely and I definitely feel that's enough.