Question:
Can someone please recommend me c64-games for 2 players which require teamwork (and not fighting against each other like IK+, etc!).

Answer:
Wizball.

And I think Armalyte, too, but I'm not sure about that.

In both games you first have to get a satellite, though.

Also Druid I & II had this option, the other player could operate the golem.

More questions: