I loved playing your game! The artstyle, music and sound effect are all great. The gameplay is fun and addictive and it was difficult to put down the game. The difficulty is well-managed by giving the player a safe environment in the first few levels and introducing the enemies and hazards later on. My only nitpick is that some of the single spikes would camouflage with the background and I would keep hitting them because I wouldn't see them.
Overall, this game is visually great and very fun to play. Nice job!