I'm very susceptible to motion sickness, so not having the option to turn on a crosshair of some kind left me feeling really sick during the entire playthrough. I had to take small breaks after each puzzle. Also, I accidently missed a line of dialogue at the rocket room. I tried to listen to it again, but the cube just said "That's all I have for you". I really wish it would have repeated lines to avoid an entire restart of the game.
Love your YouTube channel and hope the feedback helps. I hope you polish this up a bit more after the Jam because it really is great.