Toronto indie developer Woolly Walrus Games have released Block Swop for free on iOS.  From the official website: 

Block Swop has officially been released. We started the game over a year ago and it has been a labour of love ever since. We are really happy with the final project and we might release more levels later. An Android version and premium versions are also a planned for later on. For now we are happy to of finished and released our first game. We have started work on our next game Mini Lift but we are changing the name of that project. That project should be coming out in a few months. We also have plans for a puzzle based RPG dual game. We hope to prototype that game at TOJam 2016 in a month or two.

You can download the game for free right here on iOS, but also follow the developer on Twitter.