Cool gameplay! I wish there were more levels :)
It took me a while to figure out first level though. Maybe at this point I knew the mechanics and how blocks worked, but level 2 felt easier.
Some UX would be nice. Eraser didn't work for me (it would not return deleted block), so I didn't use it. But I wish I could keep blocks placed between runs to make just minor adjustments.
Art looks nice. Simple, but a nice palette and all important game objects are clearly visible.
Cheers!