Ladybug - Commodore PET 4032 - Real Hardware

I don't think I played this when it came out in the arcades, but I did play Drelbs which came out a couple of years later, which was similar with the rotating doors.
This version doesn't have as many doors, but isn't bad at all. It has an invisible maze on level 4, but apart from that each level is the same. The enemies each have their own way of moving, so you can plan your moves sometimes, and there is a mystery box that does helpful things when collected, like resetting the baddies, or slowing them down.