A couple of walkthrough questions (Supraland)

I know there are walkthrough videos, but since many moments in itagr are non-linear, it's very difficult to find the right moments in long videos.

I am already clearly at the very end of the game, I just opened the lunar gates with the help of two green moons. There are at least three misunderstandings left behind.


What should be done and is it possible to finish the place where, when the button is pressed in a large clearing, enemies begin to run in waves, and if they reach the point, the hero loses health? Or is it stupid endless waves and trolling?

Why collect red moons? I see the crap where to insert them, but I obviously haven't got 2-3 more, since there are empty spaces, and I was already allowed into the final part. Or will I be obliged to run and look for them to pass at the very end?

At the location, after the big Horror, where you must first drive a ball under glass, and then insert the battery and jump to the other side, there is a pipe with some kind of transcendental requirement for the stars to go inside. What is there? And if you do jump over to the second side, where the puzzle is with electricity, there is a building next to the blue cube. Inside is a puzzle with 4 buttons opposite each other. The game tells me that I don't have something to complete this puzzle, but why? On the hands of the usual cannon, beam pumped, teleport. What else does this dog want? )))