Hehe very good point. I'll add hints in the description or in new version.
But the aim is to destroy as many tentacles as you can, either by fucking them or shooting goo at them or as collateral in explosions. Fucking absorbs them and gives a you a stat boost, and if you do it perfect they explode and everything close by into their essence, which you can collect for a tiny stat boost. They get more rowdy after they spawn and start to glow, at which point you can't control them anymore, can't absorb them and take damage.
Color change is just cosmetic at the moment. Considered giving a stat boost depending on the color, but got sidetracked by the other systems.
Thank you for playing!