Love the artwork and all the effects that happen when I fire a weapon that I can FEEL! Adding some sort of audio would probably make it better, obviously, but you did a great job with what's there =)
I also like how you took the effort to put in more weapons and skills for repeat playthroughs/different playstyles, it works really well! Though it was hard to read some of the description text since it overlapped with the other text on screen.