Found a tiny tiny puzzlescript game I made back in 2013.  You control the dark haired twin and your blond twin is mirroring your movements. You're both tryin to reach to the portals but your movements may not always be symmetrical. I'm planning to add some more levels later.

Please enjoy this little 'short break' game.  Thanks.

https://mk-vr.itch.io/twins-into-void