The sprite (including animations) and music is amazing. I like the concept of mouse in sewers.
The game is simple, and I can see myself getting addicted to this if you change it some more.
Right now, I think the camera is a little bit too small. If the player can see further and wider, it would remove so many unfair feelings I got from this game.
The TV effect was cool at first, but I think it is too much.
Overall, this is a great game and you should be proud of what you've created.