Neat little game, my main nit-pick is that you only get a single upgrade before the final boss. I picked Radius and I assume it worked but if so it was very small. Also, the boss seems to 'jump' a bit sometimes, which may be an intentional ability but I wasn't sure. I guess that's 3 nit-picks, lol.
Anyway, I hope you have a wonderful day and good luck in the Jam!