Really addictive game. Loved the retro sound effects you went with as it really sold the idea of your game as one to be found in an arcade. Art style was really nice and colourful whilst at the same time not being too complicated. Particularly liked your mechanics, like having the entire game upside down.
One critique from me would be the ease at which you can get a game over when trying to jump on the platforms closer to the bottom. Feel like if people were constantly getting game over for this reason you could possibly lose some players.
All in all, interesting game that really brought me back into the more retro era of gaming. Nice one guys.