I really like the artstyle of this game! I'm looking forward to its development.
I played the demo, the character moves at a nice comfortable pace and feels easy to control. The player and enemy sprites are all clear and easy to read although the explosion graphics' smooth scaling felt a little out of place with the pixel aesthetic.
I also encountered some weird behavior with the drop-through ledges. If I walked off of one to the side and immediately turned back around, I'd get pushed back on top of the platform instead of continuing down. And putting drop-through platforms above some of the instant-death gears instead of solid platforms is kind of mean...