How exciting! I grabbed the the first game knowing nothing about it during a major sale years ago and it re-ignited a love for puzzle games I hadn’t experienced since the original Portal. Definitely picking this up!
Check out Relicta. Played this in gamepass last year and ended up loving it.
Looks like it might have been Games with Gold (not Gamepass). I couldn’t find it on GP but it was GwG last year.