I did this... I don't even have an iPad, but I loved the iPhone version so much that I wanted to support the developers more - I bought the iPad version, and gifted the game to a bunch of friends (I think I sent out about 20+ copies) - Yuguosoft is an amazing development team, and Robo5 is a FANTASTIC title.
I played some of it last night. Overall a good game. I'm not keen on the way it scores a level... but I guess they gotta use time to she the leaderboards competitive. Looks like the top scores though are hacked by "Doom Judgement". So that kind of ruins some of the game since its impossible to get first.