I guess you can use it as the store is full of it already.
But history tells us there have been a lot of lawsuits for games that looked too similar with fines or store removals as result.
(search for The Great Giana Sisters, K.C. Munchkin etc)
But with stores like google play most games are free and it would be too expensive to open a lawsuit for something where you can't calculate possible earning loss from as a download is not always a direct sale.