This isn't legal advice, but observations and experiences...
Firstly, nearly everyone on here publishes their games privately, and as a sole developer.
Secondly, bear in mind that 99.9% of games don't attract too much attention
Quote: "1. Do I have to/should I trademark our "company" name? - We're probably not gonna make apps regularly so we wanna spend as little money as possible. Should we even have a developer name?"
No you don't, but if you write a hugely popular game then you are open to your name being abused. You can't protect your game ideas, but you can protect names, characters and game elements (e.g Super Mario, Middle Earth, Droid)
Quote: "2. Is LLC or 3rd party publisher really necessary? - I have heard that you need to create LLC in order to distance yourself personally from the product but it's VERY expensive in Illinois. And many other publishers take hefty amount of revenue so I don't wanna give my app to a publisher. Do I have to choose or is going solo possible? Or is it risking too much? "
Not necessary
Quote: "3. Audio and image files? - I have heard that you can't use mp3 files without licensing it but is that the only audio file that requires licensing? Also, I'm using png files for all my images. They are safe to use right?"
OGG Audio is the format to use, it is free of any fees/royalties. AppGameKit 2.0.20 now includes OGG as an available format.
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