Interesting concept. It felt really good when you finally got a good belt line down, but then it suddenly breaks. I would add some more feedback when that happens, so it doesn't just feel a little sudden and unfair.
The conveyor belt mechanic is fun and seems well-implemented, and I think this game would benefit from leaning into that aspect and maybe removing the little main character guy (even though he's very cute) and instead have a static or RTS-style camera.
Also, mad respect for taking the time to implement a little mini-map!