These are some of the thoughts I had while playing:
-The intro text was really hard to read. And it ended the instant the text stopped typing, and I didn't get to read the very last portion.
-The stage music is pretty decent. It reminds me a lot of Mega Man.
-Contact with spikes feels very unforgiving - slightly reducing the hitboxes at the edges would feel a lot better IMO, as it almost felt like I would die just being next to them rather than actually hitting them.
-Controls feel good. The inertia in the character felt just right.
-I don't like how if you die in Stage 3 before hitting the checkpoint, you have to completely start over at Stage 1. It wasn't too big a deal in this game given that it was so short, but if you decide to make this game longer it would be a major source of frustration for players.
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Overall, this was decently fun and challenging. Too bad there weren't more levels - I would have played through them.