Beautiful graphics and effects with the coins falling from enemies and 2D lights. Really well done all around.
Gameplay is also fun and original (though I have completly forgot that I can slow down time and never used it). Especially the final fight was enjoyable as it introduced a risk/reward situation where you could let more zombies spawn so you can kill more at once, though it was rather easy anyway.
My only small, tiny complaint is that in the starting levels if I took damage from the wrong bullet, I would not be able to complete the level and had to wait for enemies to kill me. Would be nice to have a shortcut to restart the level in such cases.