That's a pretty good list, but a lot of those are american games. I'd add a few more to it tho...
Batman (both the movie and the caped crusader)
BMX Simulator
Bombuzal
Bounder
Bounty Bob Strikes Back!
Ghouls 'n' Ghosts
IK+
International Karate
Jack The Nipper (this uses the 1, 2 and Enter keys, so you may wanna pass on it)
Law of the West
Mad Nurse
Monty On The Run
Pacmania
Powerdrift
Potty Pigeon
Raging Beast/Ole!
Re-Bounder
Spy vs. Spy 1-3 (these are hard to find I think)
Time Machine
Thing On A Spring
Tusker
Wizball
My friend started messing around with my GP32 and got addicted to Back To The Future on C64. Which is odd, because it's incredibly bad. The absolute worst game you could put on is Alice In Videoland - it's quite possibly the worst commercial game ever, so have a look at it if you want to shock people!
Just keep in mind the C64 had a very active arcade conversion market...mostly conversions of games by Konami, Taito, Atari, Namco and the like, but occasionally smaller companies like Toaplan. It also had infamously bad Movie Licenced games (eg Cobra).