The game was made from scratch in Godot, all the art assets graphics/music are from the asset store(s) and are credited inside the game. The idea behind the game was to max out damage with combos with the limited card slots you start with, each boss you unlock an additional slot to create more powerful combos and here comes the "to the limit" theme -- hope it helps and thanks for playing my game!

Thanks, kudos to the author https://opengameart.org/users/subspaceaudio !