As I thought. Basically, I can't use the Arc Engine because I want to use my game commercially, and the terms specify that it is for non-commercial use. I tried emailing the creator but he won't respond. If there isn't anything already made like that, I'll just forget about this game, and continue others.
You should state that you want something for a commercial game when asking for it, that will prevent a lot of misunderstandings and help getting what you want faster (because there won't be answers giving non-com links or resources).
It is extremely unlikely that you'll find a free engine for 2D-sidescrolling that is available for commercial use - and the same goes for anything that has a lot of work in it. There are more than enough people willing to help others for free as long as the result stays free, but if the result is used commercially, then they usually want their part of that money and don't want to put in months of work only for others to gain money from that...
(and no, just promising shares after sales won't work either, you would have to put in money first for licences).
There are forum parts for discussing commercial games, and the classified forums for paid commissions - both contain tips on how to proceed.
You should study them, but basically it comes down to a very simple fact:
If you want to sell a game, you'll need a "selling point" - a reason why a player should pay for your game. And that can either be gained by working a lot of months yourself, or by paying others to work months on that game. As a new game developer you simply can't expect anyone to put in money for your game without proving yourself first.
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