Friend Game Won't Open, Crashes

Hello everyone! My friend is having problems opening the steam version of Tower Unite, every time he opens it gives him a “Tower Unite has stopped working” message. This also happened to him with the first alpha. Please help us figure this out because we do not know what to do.

What operating system is it? Try verifying the integrity of the game through the steam menu, or re-installing it.

He just installed it now, never worked for him yet. He’s on windows 7 btw