Congrats on finishing your game!
I liked your take on the theme. The arena change process in your game is super ambitious. I really like the idea that enemies persist per face of the die, so you have to deal with whatever state you left that side in. Having the pips be spawners OR powerups was also a nice touch.
Balance-wise, I think the game might have been served better by slightly weaker enemies and/or slightly more time on each side of the face. As it is, you don't have enough time to kill more than maybe 1 or 2 enemies, making the gameplay on each side feel a little underwhelming.
I encountered a bug in which the die flipped and I landed off the edge and just fell into the infinite void lol.
And thank you for the heads-up on the volume issue with the die flip. :)
Good job and keep making games!