This is one of those cases where you take a really simple set of mechanics that are intuitive to understand and control (good for a game jam) and you just do them well with good level design.
Initially I really liked the slow ramping up of difficulty and smooth introduction of concepts, but I found that the difficulty really spiked once I reached the level with 3 dots. Of course it's hard to do so in a game jam, but that would be my one piece of feedback - add an easier level or two before that one to smooth out the difficulty curve.
I think we actually have similar styles in terms of minimalist art and gameplay, so I would love your feedback on my game as well. Thanks for making this!