I had enough fun playing this game that I was able to unlock the hat. I thought the balancing on the mole spawn rate was fine, but only because you can shoot multiple enemies with the same bullet when they're close enough to each other. The fact that the enemies are faster the farther they are away from you make them seem dangerous, but they slow down so much when they're close that you'll never be hit by one unless you're standing still or run at one directly. My first run ended when an enemy spawned directly on top of me, but I was still able to kill 200 moles before that. Nice game overall!