I had some trouble moving backwards, probably because it takes a while to stop going forward first and then more time for the cube to start spinning the other way.
I think very subtle mid-air control might be nice (like being able to start slowing down or speeding up using wasd).
Overall, the visuals and sound were the star to me. Not sure if you made them for the jam, but they fit well together.
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Yes, the controls definitely need some work. I tried adding midair controls, but I couldn't get it working exactly how I wanted to. If I were to continue on this game, i would focus on that.
I made everything during the jam and for the jam, including the graphics and music.
Thank you for your Feedback!