@Markus
This isn't in the Android store. This is a separate site that doesn't really have anything to do with the android store. Sudoku In Space has 21 5-star ratings and 1 4-star rating on Google Play.
Android Pit is a fairly popular review site that pulls app data from the store and then allows users to downvote or upvote the apps.
This thread was built specifically to address Android Pit, not the Google Play market. If you want to discuss that, please let's do it in another thread (I agree with some of your notions, but Google won't listen anyway).
On Android Pit you must create a sign in and after we saw so many of the same exact number of downvotes for AppGameKit games we started to be suspicious.
For this reason I say "Check you games on Android Pit"
Post a link here and go and upvote each other's games. It only takes a moment to help out your fellow developers.