Quite an enjoyable little game!
UI is looking simple and clear, very good job there. I'd spend a little more time on the actual controls, for me it feels much too slippery to actually give the player a sense of control at the moment. Personally I feel like I'm just speeding through the level hoping I don't hit anything, but I can't actually respond to the obstacles on time.
Onboarding is missing, which isn't too big of a deal at this stage but should be added at some point. Cube jumping doesn't feel like jumping, it feels like the whole stage is simply shifting down. This could be solved by not attaching the camera to the cube but creating a more dynamic, smooth camera rig.
Hope this helps, keep up the good work!