Wow, amazing! The art is great, it controls smoothly, the camera works perfectly. The first boss had some fun mechanics. I really liked the Mega Man-style enemies and wall slide/jump, and the complexity of the platforming with the vertical moving platforms!
Unfortunately I died after getting the dash and hit the missing-item bug you said you've already fixed for after the jam. I'll for sure be checking back after the jam so I can see more of this game!