This game is very polished; the art, color scheme, BGM, SFX, UIs, and core game mechanics are finished and executed greatly.
Personally, I really like the pixel art, especially the variety of enemies ('heroes' as what they call themselves). Also the way the level progressively goes harder each iteration is just insane in a good way; the player must be careful of the purchases they'll make for the next round while at the same time these recent upgrades would only barely help you at all as the enemies' speed goes much faster, leaving it up to the player's reflexes on handling their numbers.
For a one man project this is so cool (also made with Godot so I'm happy to know it aaaaaa)!