Thank you Toast for your comprehensive comment; the Neoaxis sounds as an (more) interesting and better engine. It having c# is also a nice. There's one thing I don't really get though in there features list for their different license models ( http://www.neoaxis.com/neoaxis/licensing ). It seems like the more expensive models only get more access to the source code but that with the free version you can already use all the engine functions. But maybe that is me misinterpreting the words 'source code'. I thought source code is only needed if you want to change way the engine or its functions works? It now seems to good to be true to create games. Maybe it is not royalty-free otherwise?