Really solid game with a really good concept.
I love the minimalist artstyle, weird mix of rhythms and moods in the music, and dumb yet ingenious concept of it's just being random night terrors clawing into the mind of the player. Aesthetically, the game is undeniably amazing. The upgrades are really impactful and satisfying to use, as well as the absolute catharsis that is a well-thrown re-minder.
That said, there are some valid criticisms I can make. The enemy variety is really lacking, only having 2 enemies that I encountered, and one of them (the floor-deleting slime) is REALLY annoying to deal with and not fun, that is compounded by how suddenly the game jumps in amounts of spawned enemies. I know it is supposed to keep you on edge and never let you get away with too much terrain to spare (so that throwing re-minders is satisfying) but then you spawn slime all over that terrain, you don't account that effectively you are doubling the amount of destroyed tiles.
Player feedback loop and communication is lacking. While all sounds and actions are juicy and impactful, you need some informational value communicated through as well, for example the crumbling tiles aren't really crumbling, they are marked, and marked so that enemies (or player) standing on top of them can't see that mark, also the slime enemy feeding the level doesn't telegraph the direction he is gonna jump to, resulting in a lot of cheap deaths.
I would love to see a sequel to this with more content and polish, but alas you have other plans for the weekend, or so they say. Don't burn out yourself there, and take care.