Lovin' this!
What I'd love to hear is some music like the theme from The World's Hardest Game or the Ridge Racer Type 4 soundtrack. Something with that late 90's to 2000's 'Y2K'/techno-ish kinda sound. I'm bad with music genres but that's the best I can describe it haha

On the level select screen, I'd increase the speed the block moves to the next level, it currently feels a bit slow so I'd speed that up.

When you collect items, I'd love to hear the pitch increase a bit as you get closer to getting them all, it's a trick that'll make collecting things way more satisfying.

One thing I feel is missing is obstacles that move around in lines or circle around areas, I think that would make the game more challenging and more interesting (these obstacles don't have to move very quickly), it feels slightly too easy/simple with just avoiding touching the walls. I didn't get to playthrough the whole game so I dunno if something like this pops up later, but just a thought!

Pretty cool so far!!!