Oh no worries, that was literally my first level and I wondered if I'm misunderstanding the mechanics.
I managed to win after several tries, and I really love the chromosomes idea! Tbh game felt too short; I was just about to assemble an OP combo (OnWait : Heal and 3x onAttack : Cleave/Shock), thinking that I'll get very far in this run, and then... it ended :D
Btw I probably should have guessed by the name, but it took me a while to notice that Shock electrocutes water - cool!