As a fan of Neon White, I like what you’re going for here. A fleshed out version of the cube aesthetic floating in the sky would look really cool.
I won’t repeat other people’s comments about difficulty, but I also think having a mouse sensitivity slider in mouse-based camera games is really important. I probably could have finished the first level but it’s too hard to aim with my mouse and I don’t have an easy way to adjust that.
I saw that you usually make story-based games, so great work in attempting a very different genre!