I really liked how the art for the miner changed when changing size. I know it would have been quicker to just scale it, but your game is better for it.
I like this game. I think with some fine tuning it could be really great. The Jump felt just a little too floaty and the timing on some levels a little too unforgiving. Also I think it would be better if the change key was left click or something where I didn't need to take my fingers off WASD, especially for those tight platforming sections.
Overall a great game jam game, good job