Thanks for your comment! We greatly appreciate the detailed review, and will see if changes need to be made for the next update.
The MP40 is considered overpowered by most players due to it's fast one-tap ability to the head, but we will do more research about it to make sure it's a good gun for everyone.
The engine is a customized version of an old game engine from 2005 called FPS Creator, it could have had some GoldSource vibes left in it, we'll change that too