I'd love to hear your feedback. You can also learn more about the game, Sky Fish Phonics, and its adaptive learning system at http://www.knowbilitygames.com
No problem. Although I think Behance is probably better for your purposes, you might also want to check out DeviantArt (deviantart.com). It's another pretty big artist community, although I'm not sure how many game artists are on it.
One good source is Behance (behance.net). A lot of good game artists have profiles and portfolios on there. You can message them directly or post a job for applicants.
Odesk (odesk.com) also has game artists, although the quality is all over the map. You can post a job description and review the portfolios of the artists that respond to find a good fit. They allow you to do a short "working interview" project, too, where you have the artist spend an hour or two creating a piece or two of your game art so you can see how well they will execute your vision, how they are to work with, how fast they can produce, etc.
I haven't used twitter to find game artists before, but I'd image if you look for the right hash tags, you could send out a request for available game artists and get some responses from available folks.
I agree. I've been teaching my 7-year old son to code and Lua has been a great choice for him so far. After having him play around with Scratch and learn some javascript with Code Monster, we got him going with some game development in Lua with the Corona SDK. It's proven to be pretty intuitive for him and he's having a lot of fun. He was super stoked when we first put his "game" on an iPad and play around with it. I'd definitely recommend it to other parents looking for something to start their kids on.
As a game dev myself, I'd definitely love to hear more about the custom engine you used and why you chose it over the other options on the market (like Unity, which you mentioned).