I hear ya there. I feel like I designed myself into a corner with this one. I knew I wanted to do a sidescroller that uses only one button, but I didn't want to just make another endless runner game. I agree that the controls are a bit awkward. I spent the first day of the jam implementing the controls, and that was when I discovered how awkward it was to move around using only one button. I had to make a decision: either I trash the idea and start from scratch, or I had to find some way to make the awkward controls fun.
Obviously, I tried to go with the second option there. I tried to design the levels and the puzzle mechanics in such a way that mastering the awkward controls is what makes it fun to play. I'm not sure whether I succeeded or not, but this was a fun exercise in game design under heavy constraints either way. It's tough to design fun levels for a character that can't move as freely as Mario!
Thanks so much for the feedback and for playing the game. I appreciate it.