It's not trying to be Portal. It's a Sokoban game. If you like playing Sokoban games, here's a package of ~1400 hand-crafted puzzles, probably with a handful of interesting gimmicks/rule alterations to spice things up.
> At one puzzle a minute, that's 24 hours of gameplay.
Unfortunately we're not all as smart as you but in TFA he estimates it'll take 400-500 hours to complete all of them.
Hah! Didn't mean to imply I'm some sort of puzzle-solving genius, point was precisely the opposite — that solving those puzzles at a breakneck pace would still be a crazy amount of time.