Marienkafer is the German word for "Beetle" and this overhead maze game is a clone of the arcade classic Ladybug, released for the Colour Genie. In case you're not familiar with this though, it's replaces the maze walls with revolving doors. Hit them to swing them through 90 degrees, hopefully putting impenetrable barriers between your beetle and those who wish it ill.
To win a screen, you must race around, avoiding all the nasties and eating all the seeds.. although you seem to need the luck of the devil to collect the very last seed in the very middle of the maze.
It's sort of nicely put together and it reacts quite well. Sadly, it becomes very boring within only a few minutes. Next.