genuinely really good and fun aside from a hololive fangame? I'm somewhat inclined to guess it's inspired by something else but I genuinely don't know from what.
The increasing difficulty is finely tuned, the item variety is unique while not doing the #Roguelike gimmick of increasingly niche and useless upgrades.
The gameplay is smooth and combos quite satisfyingly, and the art is pleasing, really it doesn't have any apparent flaws.