I like that the difficulty is tuned up. Many games in jams only presents us with easy "introductory" levels, but i'm happy to see a proper rather than a "demo". That said, the concept itself is pretty flawed as taking too many +size upgrades can be a death wish, but the advantages they give seem to be balanced to be equal to the -size's. I played all the way to the boss, and survived a good 5 minutes against him, but then i realized his health was written and that he hadn't been taking any damage all this time, so i had to give up.
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Hey thank you for your feed back, yes upgrade balance isnt the best, that said i think you will have much harder time without any reds, still balance should be better. Im sorry to hear that you had some issues with boss, I played game now and everything worked as intended, hope you at least enjoyed normal levels. :)