battery: press <- or -> to move, and shock. syringe: press a or d to move, w to extend upwards, s to retract (this can damage battery and launch water). rules: each player has three health and a cooldown of three seconds, that also doesn't let them attack. water falls and lands on the ground, after 3 seconds it becomes hostile to battery, but battery can shock it before it goes dark making it hostile to syringe instead, having a chance to make a spark that can damage syringe. that's it.
I did it myself. I also do allow advertisements, and I'll even check out the games you send.