Good visual quality considering the amount of variety in the game's settings. Having a survival mode is a fun bonus; thanks for including that.
I actually beat the enemy at the end of the first level on the first try (not sure if that was meant to be possible). I also fell through the floor and out of the world once.
Having the camera follow the player as they jump is a little disorienting. If the player is just jumping and not landing on a higher platform, the camera shouldn't need to follow them.