"Bionics" generally means a machine which mimics a living organism. Typically, this word is used for advanced prosthetics (like cybernetic implants). In this case, didn't you mean "biological"? Or are these devices actually "artificial flesh"?
Complicate question, indeed. Original aliens using part mechanical, part biological devices. Like pure bionic USO construction. So i decided to leave term "bionic" for all such stuff, where not clear what is alive and what is machine.
Yes, even held in held.
However I've seen movie "Abyss" as well - the Abyssian (jelly men) has origin based on this.
If this race is able to form water in huge shapes, than after being hit they can reconstruct their body if not burned, frozen or dissolved.
Then even more, i dont understand why you give them supernatural abilities. In the movie they was clearly deep dwellers, with subtle body and water-bending technology.
In TWoTS, they are a "glass cannon", who can be killed with ease, but can provide huge damage if shoot first.
You certainly seem to want an added challenge. ...
Indeed, i have received many suggestions to reduce difficulty. But, as Meridian proved, mod can be done without savescumming.
Thanks for feedback.