I found Leisure Suit Larry 2 (& on the Amiga as well),"easy" ie: it's one of the few adventure games I've managed to finish without ever referring to the solution!!
A word of warning about the early Delphine games like Operation Stealth, nice game, but ruined by overly difficult "arcade" sequences.
As for Darkseed, I don't know what it's like on WinUAE, but on the (real),Amiga play it on a monitor unless you want migranes like the central game character-the first true "interactive" Amiga game!!
Try Willy Beamish. Been meaning to play this, haven't touched it in ages on WinUAE, but it doesn't seem too bad.