Of the games that are present on the Dreamlist and for which I've voted, I think that I'd be most excited to see
Rama come to GOG!
It's a game that I missed back when it came out--and one that looks rather intriguing!
Other than that, there are two games available on other platforms that I'd like to see here:
Operation: Inner Space, and
Baba Is You The first is exploration, flight, and combat (with a bit of racing) inside the space-like realm of your own computer! The second is a weird-and-cool puzzler in which a major mechanic (as I understand it) is reworking the rules of the level.
As to games as-yet not available on the Dreamlist, I've requested the addition of
Isis.
That game is an old Myst-style first-person puzzle-game set within a pyramid. Tasked by Isis herself, the player must fix a cosmic space-ship that was sent to spread music and peace (specifically, the music of the band Earth Wind and Fire--yes, the actual band) to the many worlds.