Thanks for the feedback! I didn't play the game full screen during the jam, and realized after submitting that it wouldn't stretch. So yeah that's something to improve. The art is not mine, but I'm glad it looks cohesive.
I agree that accessibility is important! However I will point out that nothing in the game is identified solely by color: the dice have colored outlines but are mainly identified by the number of pips, and the color of the gems is determined by the room they are in, which have 1 to 6 pillars arranged to match the die faces. The game is equally (un)playable in black and white.
That said, you're clearly not the only one who didn't make the connection between the physical rooms and the die faces. The pillars were literally the first thing I put on the screen, so it never occurred to me that people wouldn't pick up on their significance. I should have asked someone to playtest it during the jam. Lesson learned for next time!