Does this game come with the sequel Heart of the Alien? I think both games should be sold together. Maybe as a free bonus when you buy the game

No, Heart of the Alien is not included. I think it's a licensing issue, as someone else owns the rights to it.

The author of Another World, Erich Chahi, appears to own the rights to the game now and it's his own special edition that is being sold here. He was not involved in making Heart of the Alien though.

Ah ok thanks... so no chance for heart of the alien then...? i could have sworn I've seen Heart of the Alien as freeware or abandonware somewhere in the net... but then again i might have been dreaming... I think i'll go back to bed now... keep dreaming...

I wouldn't necessarily say there's no chance, just that it's probably not trivial for GOG to get the game. Also, most people seem to think it wasn't very good (I haven't played it myself) so there may not be much incentive for GOG to get it. It's possible that in signing a deal with a new publisher GOG might also get the rights to Heart of the Alien though. I don't know who has the rights at the moment, but I do know that GOG has announced a few new big publishers to be added in the coming year.

Wasn't Heart of the Alien only released for SEGA CD? I could be wrong but I think there is no PC version of that game.

You are not wrong, there was never a PC version of the game. However, there is an attempt to produce a PC port of the game currently available, but it does require the original Sega CD to play.

http://hota.sourceforge.net/

Like "cogadh" say, there was never a PC version of Heart Of The Alien. But you can use a Sega emulator to play it in a PC. Here you can find a good pack with Heart of the Alien and the Fusion emulator: http://sites.google.com/site/interlinkknight/downloads

In there are also icons of the game.

Thank you for the link. I finally did play the sequel of Another World. It is the same as Another World but not as good (the story is quite difficult to understand). Otherwise, I would say that people who enjoyed the 1st one will probably like it.

The version from InterlinkKnight's link worked flawlessly. Thank you.

Damn pity Interplay has some of the licensing on this. It would have been great if both could have been in the 20th anniversary. As is you'll have to find a sega CD version or rom it.

https://www.mobygames.com/game/heart-of-the-alien-out-of-this-world-parts-i-and-ii