what i played of the game looked really good but sadly a little after i get the gun and the level starts it crashes :(
I would try and update to 1.8 in that case, as that version has proved to be more stable and performant on some systems.
As of right now, that version only has one level which hasn't been artpassed yet, but this also increases performance and lifts the load that your PC will have to carry (Additionally, that level is designed a bit better in my own opinion)
Hope that helps, if not, then I am truly sorry!