Well.
There's is something interesting going on with blood that make the character going faster. Too bad the game is too easy to use it effectively. But the potential is there.
Another improvement would be having ennemies that must be killed with 2/3 shoots so you have to regenerate by killing smallers ennemies.
If you ever do a better version, you should definitly add more juice. It's a revolver ! Go with screenshake and a loud and clear BAAAAAANNG sound :D
Oh, and i like the music, and the light system is rad.
But anyway, it's a nice entry for a 48h made game.