This game feels really hard. The fact that clicking moves your character AND is required to charge the gun means that I'm often dashing straight into what I'm trying to shot, as my instinct is to click on the thing I'm shooting. Using arrow keys for movement would be an easy fix for this.
Also, the whole joining three together thing to kill the angry circles is fine, but that on top of the wonky movement style and the fact that your laser has to be charged before it's fired is too much. Either let the player move more freely or keep the joined mechanic, but both is just excessive.