Wow. Just wow.
This is amazing. If you really did come up with this in your sleep, You should take more naps.
The graphics are among the best I've seen on Newgrounds. I especially liked the use of shading, like when the little hammer guy is running past the lamposts. And the fact that you made the music for this is simply incredible. This is easily my favorite submission so far. Good work!
If I had to criticise something, It is a little repetitive in the beginning and the Dinging sound in the music is sometimes about 1/8 of a second out of synch with the hammer. But really, how picky can you get?