A number of other apps/games are free, too.

Sorcery! 2 is great.

Delicious - Emily's True Love is kinda cute casual time management game. Be sure to get the full, $5 version, not the free to try version that has only 4 levels.

Saw the post on /r/androidgamedeals which was a UK link that I can't open. The only free game I saw when I submitted this thread was 80 days. The US link was taken from the comment in that thread.