For me the game is too hard. And I was confused since you reused the player sprite for an enemy trajectory. I collected them since I thought they might heal me. I'd suggest to make a different sprite for it or just use one of your others instead.
Yea I agree, a difficulty ramp like one of the other comments should've been added. The power you gain from the slime projectiles does heal you and feedback noted, it can get a bit confusing with all the different sprites flying around. I'll be sure to check out your game as well.
