Gex
The Neverhood
Lode Runner the Legend Returns
Theme Hospital
I would be really happy with just those 4. Gex is actually one of the most underrated great 2D platforming games. The Neverhood is one of the most underrated puzzle games. Theme Hospital is awesome, and everybody who has tried it would agree with that. Lastly, Lode Runner the Legend Returns is just the best Lode Runner version I´ve played, with a really powerful level editor (you can make levels exactly as the official ones), many great gameplay mechanics, 2 players mode, etc. I remember doing 500+ stages with it.
I really really recommend these 4 games to everybody.