This was interesting. It seemed to work, but I was admittedly able to beat it by kind of just spamming different blocks along the ground. As a result, I’m still not entirely sure I understood what was going on.
Reading through the description though, this sound like an interesting concept, and I could imagine this getting tricky if you were able to put together levels that forced some more careful consideration of which blocks you were placing where. I could imagine it making sense to have the player progress the time (e.g. with space) rather than having it happen automatically, so they have more time to see how things are unfolding and consider their actions more carefully instead of just guessing because things are already happening.