I've really been enjoying the app so far, but I have a few suggestions.
It'd be nice if I could save presets, as clicking through 10-15 games each time I open the app I can miss one or two.
I'd also like to be able to reroll challenges with the same set of games, so that I have a chance to play some of the other games I selected without reselecting everything.
These are just a few suggestions, but its your app so of course you don't have to do any of it; overall is seems both functional and fun.