This was pretty great. I loved the artstyle and general vibe of the game. At first I thought it was going to be pretty annoying have to re-fight the previous bosses when I lost, but getting to one or two shot them once I got strong enough was actually pretty satisfying, and I think the loop of exercising, seeing how far you can get, then going back to exercising is a good one. On the negative side though, I didn't think the exercising mini-games were particularly fun. Maybe something more engaging like having to hit buttons with timing would have been more fun than just having to mindlessly mash. Also, I wish there was some way to level up your jump. As I got faster it actually made jumping over enemies harder because I had the same low, slow jump but I was moving left to right very quickly.
Overall though, a fantastic entry with lots of personality. Great job!