Other puzzle game recommendations

[Earthling]

Just happened across this thread again and thought I'd mention I checked out Corrypt after it was brought up here. Very unique, would definitely recommend! I found myself stuck for awhile after the twist, unable to figure out how to solve it, started the game over a few times and finally gave up... and then months later, the solution suddenly occurred to me, in an "Oh why didn't I think of that before!" kind of way. Was fun.

I also found Zaga-33 by the same guy to be a good game for repeated play when you have time to waste.