Sorry for the DP, but I found them.
They are indeed only avaiable on german.
The games are called ROBOT and 5 episodes were made (Jr. which was free, and I-IV, which still are Shareware).
The company that made the game was called
Tom Productions. Beside the Robot-Series, they also made a few other, pretty fun games. My favourite one is PC-Bakterien.
Seeing how the games still are sold (but avaiable as Shareware) and english versions were never made, this may only interest the Germany people around here.
Oh, and to how I found them: I stumbled over an old Shareware-CD, called "Spiele 3". Was one of my fav CDs way back
Getting a feeling of nostalgia, I browsed the CD and bumped into the ROBOT games.