Superb visuals and atmosphere! Great visual clarity from the art used. The character had great weight, and building up momentum and hitting jumps felt great when I pulled it off!
For me the single button control system got in the way a bit too much. Some areas in the level were difficult because I couldn't reliably get the character to do what I wanted. This is worst in the tap/double tap case. For me, multiple button controls, and expressing the theme elsewhere in the design would have been preferable.
The level design was good. The tutorial area (and title screen) really helped me get comfortable with the idea. I blazed past the sign that let me know I was heading into the different endings part of the level, so maybe that could have been placed next to a blocking point or a jump or something, but otherwise it worked really well. I got strong sonic vibes from the 2nd half, falling down and trying to get back up. I can't believe how polished this feels for a first game jam submission!