Interesting...
It's interesting, no doubt about it, with lots of potential. The biggest downside to this is the filesize, which, as you say, is because of the artwork. Maybe a few less levels to unlock? I also found it to be a little bit jerky, but that could just be my 'puter.
Overall, I like it. I like the concept, I like the violence, I like the twist to it. Keep on!