Hi, Dune. Thanks for the welcome and the kind words and advice. Sorry for the late response--I didn't see it right away, then I ended up with a full time job and I don't have time for anything anymore =P
Yeah, I did take a lot of creative license with Parasitis (the slug). In my defense, you only see it during a brief opening sequence and you spend the whole actual game inside of it, so I think I can get away with changing it. I'm trying to do that a lot less with other enemies--I'm trying to only make changes where I need to for it to make a little more sense, but I'm trying to keep the integrity of the original as much as I can.
I have done some more drawings since those first posts:
Some Level 1 Enemies:
Level 1 Boss, Deathface:
I figured Deathface should look a little less human-like, and I added a long tongue as a weapon. The original fired projectiles which I have a hard time accepting for some reason.
I'm currently working on re-coloring Bau (the dog). I think he looks good, but it was the first one I did and I ended up making the colors muted and "natural-looking", but since a lot of the ones I've done since have been more colorful, I feel that Bau should match.