Doc0075: Some great games already mentioned and as a massive Amiga fan I'm going to add the following to the list.
Flood is often overlooked, made by the legendary team at Bullfrog.
Rainbow Islands and New Zealand Story are two great arcade conversions on the mighty 'Miggy.
Wiz 'n' Liz and The Addams Family are both a lot of fun.
Chuck Rock and its sequel are worth checking out and Rod Land too.
Other games to have a look at are - Elf, Cool Spot, Fire and Ice, Jim Power, Leander, Magic Pockets, Myth, P.P. Hammer, Qwak, Snow Bros, Toki, Traps 'n' Treasure, Yo Joe.
I recall playing the Sega versions of Addams Family, Chuck Rock, and Cool spot when I was young.
Myth is actually one of the reasons I'm so interested in this genre, someone turned me onto Jeroen Tel's music for it and I was so blown away I started looking into the game and genre.