Hello, this game is pretty fun to play. There are a few things that break the feel and require polishing - 

• The Rotating player animation while we jump breaks if we keep on jumping continuously. 
• The spikes are way too large in comparison to the jump distance of the player.
• For some reason, the player is able to overlap some part of the spikes, maybe you have not used the collider as a full sprite and there's a gap. 
• The difficulty is way too high at the start, so consider reducing that a bit and gradually increase it as you go. 
• You can then think of adding other obstacles and features to this game once the core of this game is completely fixed and solid enough. 
• Also, try changing the visuals of the game to something very decent and minimal if you don't want to go towards a stylized and some professional look.