Unfortunately, I am unable to play the game. First of all, not clearly showing what the controls are is a huge mistake, especially when they are (apparently) so unintuitive. I say they are unintuitive because, other than the obvious wasd + space, there has to be some other button I'm unaware of. I am unable to complete any of the levels. I get to the part with the weird flying rectangle that moves vertically, and I am unable to proceed. This is both for the cave levels and the mountain levels.
If you could tell me how to proceed I would be grateful.
Edit: turns out you're supposed to hold space as you hit the rectangle. How was I supposed to know? This game has potential, but it's missing some clarity, it plays like a game from the 80s. Not to mention, it permanently loses focus as soon as I click anywhere outside the game window.
After beating the game, I'd say it has a nice design but it's very bare bones. The shop stuff wasn't really clear either: apparently I pay some dude to clear dungeons and get my shit components back? It seems you don't even have to play the difficult cave levels, although I did, you can just replay the same surface level over and over and win.