this game makes very nice use of the theme. it's also got great style :) i agree with a lot of the other comments about wanting a stronger sense of progression and more feedback from the game.
despite its sunny disposition, the gameplay evokes a darker mood... every time a hero dies, because they're unrevivable, it feels like a great loss. the enemies continuously coming at you, getting progressively stronger with no indication of stopping makes me feel like i want to retreat and catch my breath instead of charging forward. that kind of dissonance is cool to me. if you were to keep working on the game, you could lean into that if you wanted to.