Yea I know, Im a huge super robot fan so I can identify all the homages. GL is one big mecha homage pretty much. It's biggest inspiration is Getter Robo. Getter Rays = Spiral Energy, varios Getter Robo villains = Anti-spiral(the energy they used threatens the universe), Getter Emperor = TTGL(as amount of energy increases, size increases) and the shit-eating smile Simon has looks a lot like Ryomas.
And obviously the varios Captain Harlock references with the outfits and ship.
And the inazuma kick(aim for the top/2)
And I could honestly go on and on