Nice to see some C=64 action here on A.org
Right now, I'm in semi-passive cartridge collecting mode for the system. Up to something like 60 different games on cart. I'll have to check out all the recommendations you guys are talking about, but I really enjoy the classics on this system. Slapping in a cartridge helps make the C64 seem more like a console game system vs. a computer and there's no wait time for 'em to boot up! lol
So, the old school schmups (as the tweens say) we've been enjoying on cart lately include:
Centipede
Defender
Galaxian
Gorf
Gyruss
Omega Race
Robotron
Sea Wolf
Wizard of Wor
...it'll be fun to re-visit some of the newer schmups I had in the 80's, but honestly, as someone else mentioned, I reserved that kind of gaming for the Amiga back then.