I saw this game during Mark Brown's playtest stream and I had to look it up and play it.
I find this a genius concept for a puzzle game, and I am impressed with the quality of the level design it has for a game jam game.
As for some constructive feedback, when playing I felt the controls felt a bit awkward, the character would move and jump too much, and I often felt like the slightest movement could result in me accidentally falling off, this mixed with the lack of a crosshair to know where I was shooting, and the permadeath, made the experience for me being more about not falling off accidentally, than about creating a path for myself by shooting cubes.