It's a neat concept, pretty polished - everything seemed to work as expected 😁 I think I'd agree with everyone else, the conveyor belt needs to be quicker and it feels a bit clunky to move around. I get that you're on roller skates, but ice levels are generally my least favourite part of any game 😉 the dash attack is pretty OP and you can cheese the game really easily with it, I found!
The music and sounds fit the game well, though they felt a little loud and jarring - it's a jam so I'm not going to judge the mix too harshly, but it's definitely something worth looking at if you expand the game :) the aesthetic is strong, honestly my favourite part of the game by quite a long way - plus everything is super clear, which is a big bonus!
If I were you, I'd pick either the conveyor belts or the donut physics and stick to your guns. If you're going with conveyor belts, maybe the boss attacks could interfere with the conveyor belts in some way, knocking things off, pausing/reversing the conveyor belts, poisoning donuts, etc - I think that would be a good extension of the game. Maybe you do that in later levels, but I will confess that I only got past the second one. The movement is just a bit too clunky and having to pick up and drop things was a little bit too frustrating (I'd suggest increasing the radius so you can pick things up from further away, or automatically pick them up when you hit them & automatically dropping them onto the conveyor belt when you walk over it. That would streamline the experience for me! Also make the player move faster, if you're gonna lean into the roller skates I want to be able to move fast at the very least. That would have the additional benefit of making the game a bit more chaotic :D