Hadn't seen this posted so thought i'd share. Requires a US, UK or EU account but i'm referring to the US prices.
Download Colouring Book for free then purchase over 50 games for 49 cents each. Decent selection of games as well.
They've also just added another publisher with some amazing games starting at 17 cents (Badlands). Blazing Beaks is also a must have and only 44 cents.
Blazing Beaks is great. I can also recommend the bit trip games and Rekt. Wrecking Ball Adventure entertained me for a good while, but Koloro is very much a case of style over substance.
I haven't played any others, so I can't speak to their quality, but I guess I can say that every one of their games I have bought have been perfectly good entertainment. Especially Blazing Beaks and the Bit-Trip games.