For me there is only one C64 forum on Internet that will answer all your questions: the one at Lemon64.com
. I was a regular visitor of this site a couple of years ago but I lost interest when every single topic about the C64 was discussed.
About your C64 game-questions: The first one is easy. It is Tooth Invaders
by Commodore in 1982.
I am not sure about the second game you requested. The rotating parts remind of Activisions Zenji
although it could be Idea's GearWorks