1. Minigore 2. Inkvaders 3. Hero of Sparta (although I bought it at $5.99) I really don't get $.99 games. They're just not my thing usually.
MX Mayhem, West Bang and Slugger are all fantastic apps. MX Mayhem contains 7 stages and has online leader boards, very challenging to reach high up the boards and a really great, fun app. Can't wait for the new content. West Bang - Great game, varied enemies and all round very polished. 2, 3 or 4 doors with enemies you need to shoot in varying waiting periods for each enemy. Slugger - Surprised to not see this at the top of everybody's list, superb game both online and on your own.
In no particular order The Creeps Doodle Jump Minigore Draw Race Pocket God Honorable mentions; inkvaders (a bit too challenging for a casual gamer) and GI Joyride (kind of repetative) I don't really recommend knights onrush it's ok but gets relative fast in a bad way. Hero of Sparta I think is too short for a game of that calibre.
Only picked the ones that look like they'll stay at 99 cents. Return to Mysterious Island Flight Control Saucelifter Must.Eat.Birds Mr.Aahh!!