I instantly die when pressing play.
I would recommend placing some platforms under the player when the game starts so players can get familiarized with the game environment before having to do inputs. As of now, I have to instantly press right to survive when I start the game.
The controls are very rough and it's very hard to do micro-adjustments. If you changed the movement to have some acceleration or that inputs would ramp up in strength when held in so small taps would do micro adjustments I think it would be a lot easier to maneuver and get the player to where you intend / to want it to go.
The game is really lacking sound effects. If you are not an audio designer then I recommend checking out BFXR, it's a really easy software that anyone can use to generate 8-bit sounding sfx! :)