After win in 15 rounds, I went down to the comments and read, "You can hold left or right while Bumping to control the direction of the dice." I realized I'm pretty silly. Incredible game.
The instructions could have been a bit better, I'll make sure to improve that in a post-jam update.
Thank you for playing!
I just realized I didn't mention this in my original comment, but the animation of the dice when it falls is just beautiful.