It is truly amazing that the save function does not work properly. I saved a game and came back to it after a while. Unfortunately I had to realize that save game was gone. So I started over and saved the game once again. Now that I've just come back to the game my second save was reased and first one appeared again!!
I also think that you should keep the game in english. The german senteces are mostly wrong.
 "Sonny 2"){kind=icon}
 "Learn to Fly"){kind=icon}
 "Bubble Tanks 2"){kind=icon}
 "Spewer"){kind=icon}
 "Dino Run"){kind=icon}
 "Civiballs 2"){kind=icon}
 "Prizma Puzzle 3"){kind=icon}
 "Snail Bob"){kind=icon}
 "Me And The Key 2"){kind=icon}
 "All We need is Brain"){kind=icon}
 "Kubmic"){kind=icon}