The game has a nice visual style, although simple. The big box, in my opinion, is a little out of the general style and probably could be replaced :D
Regarding the power-ups, I liked their implementation. The only problem is as if the game wouldn't have suffered at all if they weren't there and the ability was given at the beginning of the level. Simply put, they only work as abilities. It's great that each level has its own unique power-up, but maybe it would be cool to make them even more strange and diverse.
Personally, I had problems playing the browser version. It's great that they got fixed during installation.
It will be great to see the follow-up work on the game after the jam! It has potential.