Some really neat concepts in this game, I especially loved the idea of having randomised level modifiers! One glaring issue for me at least was the sound effects for the cannon-thingies, having all of them play a sound effect every time regardless of if they're on-screen or not got a little distracting. If you plan on updating the game further, it might be a good idea to make sure that they only make noise if the player is within a certain radius of them!