Game not working on other pc

Hi.
My game runs on my pc, but when someone else tries it then it crashes. I don’t know what else should i include in the folder of the game, or is there some way for users to not need to download mono game installer to be able to play the game?
I didn’t know how should i make an installer so i just copied everything from the debug folder.
Can someone help me with this?
The game can be downloaded at http://tankformer.com/download

Another question:
If the game is made in Windows 8.1 then will it run on Windows 7?

Thanks in advance.
Ryeki

You may need to build in release and copy over?