In this game you have to help a cute little green animal switch off some kind of "evil" mechanism. The "power off switch" is hidden somewhere in high towers. On your way to the target you need to avoid a lot of strange robots that guard the tower.
That sounds all like a normal jump and run game. What makes this game different is that you walk arond the tower which is revolving on the screen, so that you only see the 180° that are currently visible.
The game is a reimplementation of the old game known as Tower Toppler or Nebulus. It was available for PC, Atari, C64. The author was J.M.Phillips and was published by Hewson software. I have seen the PC version on quite a few abandonware sites. But it is only a DOS version and uses ugly graphics.