Splendid entry! Simple but well thought out. The atmosphere is sold perfectly with 3 colors and some sound design and it is a satisfying experience overall. The only tiny annoiance I would say is having to press for the upgrades in the middle of the action without breaks, in later stage it became annoying. Other then that, fantastic job
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Totally fair, ours dosen't have half of the content we prepared ahah
My 2cents: Maybe plan the enemies as hordes (since you have the bosses too) and open the shop automatically after beating one, like in Vampire Survivors when you level up. It's less flexible maybe, as you can't upgrade on the fly, but it puts more stakes on reaching that milestone and gives you room to think