After some time developing games for others I'm thinking of moving towards my own productions. My background is 10+ years of software development, with last 2 years spent on the iOS development (Objective-C and CoronaSDK).

With my current experience in Corona I can quickly develop for iOS and Android systems. And this is something that I'm probably gonna do with several of the game ideas I have, at least for the prototype part.

But - I'm wondering if it's not a bad idea to focus on those 2 systems only. After all there are other mobile platforms, there are PCs, Macs and Linux boxes... All of them having gamers using them.

I was wondering if it wasn't a good idea to try some other SDK, giving me more flexibility when it comes to platform-independance. There's Unity3D (I think I can develop a 2D game in it though), there's MoAI from what I checked.

I see a few options, not sure which one is best as I have little experience in this field (publishing own games):

1. Stick with CoronaSDK for the whole time, release for iOS and Android platforms, screw other mobile devices and PCs,
2. Use Corona for prototyping, then when the idea goes more into the "production" phase rewrite it in MoAI or Unity3D for more platforms support,
3. Start with one of those 2 SDKs right now (which means the prototype phase will be delayed a bit, but after that I can jump right into real coding).

Any clues here, what to do?