Wow, this is a perfect example of a great game jam entry. A short, fun, replayable experience that I am going to have a fun time messing around with later today. I love the dice mechanic, as it fits the "Chaos" RNG, where you can either make things easier or screw yourself over with a big roll. The attacks like the laser, and the bullet hell elements both get overwhelming which fits the theme perfectly as well. And then you have the nice dialogue, pixel art, and the overall visual effects which really help add more icing to the cake! :D
Some suggestions I have, which most of them are minor, would be some balancing effects on Biboo's attacks. I had some struggle aiming or shooting Biboo's pellets, and they sometimes would get "stuck" and won't come out. Also, I ended up forgetting the shield mechanic existed and resorted to running around attacks, so either making the mechanic more apparent or making a special attack like "Cuphead" to deal more damage might be good!
Overall, this was a really fun game and I really enjoyed playing this entry! This was so good!