nice idea, of having screen flipped, good work.
but, i can kind of, jump mid air so, that is something :D
at the end, i made the 2 slimes, reach the flag sprite, but then, nothing happened, controls could have been better, if i am falling, and move towards the wall, i can get stuck mid air, until i let go of the move keys.
but yeah, regardless of those, good work.