Hi!
As far as I understand, its okay to sell the game without paying anything (although I will donate in the future).
But is there anything you have to think about when you go about this?
like:
1. Do I have to credit any specific things from the engine or creator of it?
2. Is there any integrated parts to the engine that is not made by the engine creator, that has to be paid for?
Anything more to think of?