Really interesting game idea (though in the end I don't think it was quite for me)
Having to be economical in even the easy levels to be able to attempt the harder ones was interesting. And, I couldn't quite tell, but if you went back and did an old puzzle level more efficiently (like with the new upgrades) did that increase the movement you had for other puzzles later?
I did feel like the controls were a bit finicky. Might have been something with the web build but I felt like I often had to push a button multiple times to get it to work, and I didn't think I could hold to move at first, but then about halfway through that started working.