re-re-tested:
after doing intended, to have 2 cubes, in exit area.
I re-aquired the 1st:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=1562932140
but why make this posible, without a further use for it ?
you have some good ideas. & fun to play.
but the 1st exploit & now an extra, no longer needed cube ?
I suggest either removing the ability to re- aquire the 1st cube. (when it has served it's purpose)
or making it an essential part of the puzzle.
as I said. it was fun to play. trying the different objectives.

ps. the exploit involves putting the 1st cube onto the left button, (when facing the exit)

re-tested.
I see now.
I suggest to eliminate exploit.
that you change the cube that spawns to the left button, (when facing the exit) to a sphere.
& change the button it goes onto, to a sphere button.
this (if I got it correct ?) should make your intended solution obligatory.
hope this helps.

Your not meant to but the first cube is

same question as IanMcFloyd.

What's the purpose of the area behind the Laserfield? I. didn't need to go there :)