This is an excellent little map of medium difficulty; thumbs up! I think you may get some less experienced players who get stumped and maybe even rage-quit. Here are some hints for anyone who is stuck on this map (delete if you don't want these hints).
General hint : The trick is in re-spawning the non-companion cube .
First detail hint : Exchange the non-companion and companion cubes, then re-spawn the non-companion cube .
Second detail hint : Re-spawn the non-companion cube into a portal so that it flings past the fizzler while you stand on the second button .