The game is pretty neat! There seems to be a chance for the enemy to miss when they attack. I assume it decreases with the tougher enemies? If not maybe you could have some sort of streak mechanic where not hitting a squid block after a certain amount gives you some bonus other than score like evasion. I could imagine a little multiplier that has different stages of shakyness for the feel. But thats just spit ballin. For your first game this is tightly made.
Also the floating crosshair was a nice touch too.