[Actual critiquing! Gasp!]
I notice from that spritesheet the sprites are actually kind of weak. They completely lose all of the definition when viewed from a dsistance at high resolution.

However, at higher resolutions, the sprites look much better. The lack of contrast in the shading becomes less and less apparent.

The colors that Pixel chose to use are odd because they lose visibility on black and white backgrounds. This is especially odd given the fact that much of the game takes place against a black background.

I decided to try adjusting the colors a little bit and I think they look better. The increased contrast, I think, adds more to the definition and makes him a little more distinct as a character. Of course, it doesn't help much with the low-resolution but it does add a better separation from those little green things and his face.



I tried to put this into the game though. Wouldn't work for some reason.