Congrats on submitting your game!
I was stunned at how much I ended up enjoying this game. I was sorta disappointed there wasn't a secret 4th phase! My favorite part is that you let the player be OP. So many games try to "balance" and not make it too easy, but there's a fine line to walk between "too easy" and letting the player feel powerful. You nailed it. I loved watching my 1s and 2s get upgraded, then my 4s get doubled and doubled again. Wonderful.
The die rolling for the number of pip missiles to fire at you was a nice use of the theme, but it would have been fun to see that incorporated somewhere else into the attacks, too.
And as much as I enjoyed feeling powerful, I felt the boss phases went on a tad too long. While it's good to keep them pretty easy (especially for a jam game), getting to that powerful end game took a little bit longer than I would have hoped. Some of the boss attack rounds felt like they dragged on a bit too long. But this is mostly just a balance and playtest issue, and y'all did a great job with what time you had.
Well done! Keep making cool games!