Thanks for playing! Maybe your cursor was too close to the cube after landing, and that's why it was not moving? I would love to hear when the problem occurred because I tried to make cube's movement as responsive as possible, so It would be nice to know what mistakes I did.
I think it was related to cube jumping when I released the button after smash (Hit == click, not hold in my gamer brain). But when I got used to it, it was not a problem