wow the level design is so cool!! i bet your level designer is a really cool dude!!
(mandatory disclaimer that im the level designer and this is a joke, enjoy the game! any and all feedback is welcome.)
you failed multiple times mate, backbrounds ends at multiple levels and dark void can be seen, some spawn positions are messed up, and more more more, but i wil lrepot to ur friend(i think) who gave me the link. But overal, this is pretty damn cool thing! Great job, keep it up!