Each game uses different controls, most DOS games use the keyboard arrows. Some will use the mouse , "Alt" and "Space bar".
Mr Bill's Adventure Land describes the gameplay thus: This is a science fiction type game with Bargons / aliens that you need to avoid or shoot while finding out how to keep the Earth from being destroyed. It relies mostly on puzzle situations, with some elementary shooting as well as a tough underwater crab mini game (shoot the small crabs without hitting the big crab). It also relies on finding items and clues and figuring out how to use those items in the correct way and in the correct places.