Hello Impz0r !
- The licence of the engine is a commercial one, if you buy the licence you are able to sell your game without any extra cost and limitations.
- You can sell unlimited number of games B)
- The licence is a per user one, so if you are 2 people who are using the engine tools to make your game you need to buy two licence.
- As far i know the engine is working without any problems in C#, there is one sections in the forum dedicated to it and it's quite active.
I recommend you to buy this engine, it's start to be very great and the comming features are very exiting, tesselation, new networking, Highly optimized rendering system....
Have Fun
EDIT: Pixel Perfect was faster