the game i made is free. it is a personal endeavor to try to help better the lives of young girls/women...http://itunes.apple.com/us/app/grade-invaderz/id348665724?mt=8
i plan to update it using c2.
yes, i have a 1st gen ipad now.
i don't know if you are asking me, or everyone, i hope everyone, but i believe the first level is the hardest, followed by the third and lastly, the second. but i personally believe, that difficult levels in a game like this are good and needed. what you might want to do is use the easier levels to 'teach' the player tricks that they will need to finish the harder levels.
hope that helps.