5lider: I think sandboxes-like games and roguelikes have that characteristic, that you don't need to finish them to feel good when playing (off course I am talking about ones that can be finished ;) )
That way I like:
- FTL
- Don't Starve
- King of Dragon Pass (once I was very close to the end, I have been king already :P)
- Neoscavenger (it's still early access I think, the interface is terrible in the usabiltiy way, but good is that its the same for all of the layers of game, AND the game has great experience, I recommend it after all)
I don't personally know anyone who can beat FTL. I thought I beat it once, but then I didn't. And then I thought I beat it, but then I didn't. After I discovered what I had to do to actually beat it on easy mode, I haven't played it again. Nonetheless, I still put in plenty of game time and absolutely loved it. It's a good one.
I seem to not finish games these days. So pretty much anything I recommend I haven't beaten. I recently wrote a review for Risen 2 that said that I haven't beaten it, got bored and annoyed with combat, but I really love the game. I might start all over and build my character very differently. I get cocky and put as much as I can into silver-tongued-ness and then end up losing big-time in combat b/c of it. You just can't do that in this game.