Android checkers reloaded

During my x-mas holidays, disappointed with the measly 5000 downloads I got over one year of my free Android Checkers Tutor App, I came up with a great plan: make it a paid app instead of free - like that, all the people who know nothing at all about checkers won't download it and won't complain about the must-capture-rule, and won't give it bad ratings. Great plan, but with 6 sales in 40 days, it didn't really work out... Not one to give up easily, I have decided to revamp it a bit. I've started making the code cleaner behind the scenes, and also tried to improve the looks of the app. Not too sure about whether it's an improvement - what do you think?