Is it legal to receive donations for a CS?

[jssjr90]

If you are using any game engine that has a copyright licence to it and or using any models from the original game itself, then yea, I believe it would be illegal. Your making money off other peoples work. In this case, Frictional Games game engine, and models that you are using that is theirs from the original game. So its best if you don't do it.