I have to start with saying that I'll only talk about the bad things, everything that I'm not saying anything about is good :)
1: Explosions. They're not that good, just a couple of frames long. I think you atleast should add some smoke and debris to make it look more realistic, maybe even make everything a little brighter during the explosion.
2: Blood. It's fine as it is, but it would be awesome if the blood had different colour depending on clock-colour. And you should add some wallblood and some bloodsplurts too.
3: Gunshots. Instead of using Krinkels shots you should make your own, custom gunshots. It's not needed, but it would make everything better. Making them glow is also something you should do, as it makes it look way more realistic.
Well, that's all I can think of. Overall I liked it, and I wish you good luck on coming projects of yours! :P