Electrokinesis is literally chucking a lightning bolt at someone. It's not a mental attack. Neural overload is directly overloading their neurones. Bilocation I can see as being confusing if you aren't aware that the doppleganger is an apparition attacking your brain.
And I would call both electrokinesis and neural overload mental attacks, because they both are made with your "mind powers". If you mean "mental attack" as an attack made to the nervous system, then that's my point - renaming it to mental/neural/whatever would make the distinction clear.
I have played the game only after it was released and never played early access, which means I knew very little about it. I started with a psi user, so electrokinesis and neural overload were quite clear from their description in-game, but I had problems figuring out what bilocation does, since I've missed the cave on the silent isle on the first trip. Audio and visual effects weren't that helpful either, if anything they made it more confusing.