I'd like to start a list for people on this forum to post their favourite free games.
There's only one rule: No MMO's.
Also feel free to talk about your favourite Flash games they aren't off limits.
Star Trader RPG for Android is simple and fun.
It's a bit text heavy otherwise I enjoy it.
Another fun Android game I played was; End of Aspiration.
It's a very simple RPG that's just fun to play it's got an interesting storyline.
For my last suggestion I would say the "Thing Thing" series is the best Flash game series I have played on this site.