If you ever make a plush out of the die, I'll be your first customer!
Very fun game, more than I was expecting for a game jam, I enjoyed the dice-roll mechanics (very useful to go through spikes).
I've experienced the clicking bug (it seems you figured out it is due to the shader, it's no heartbreaker).
Did you use move_and_collide? Not being able to slide on walls is quite frustrating at time, especially when trying to fit in a narrow passage way, or fighting in an arena full of pillars.
Apart from that, very well done, congrats!