Did you do all the art yourself? This looks great! The only tip I would give is that in gamemaker you can use the "build" option to create an .exe that other people can play on their desktops but great work! You should be proud!

I saw the video as the file was unusual and new to me, It looks amazing, the sound effects are awesome and the music sounds nice, wish I could have played it, maybe its possible who knows

Looked pretty cool from the video! The gun fire and reload were very well done!

Love the look of this. The rapid-recoil feels great -- I still can't really tell if I'm seeing screenshake or the vibration of the gun, so the subtlety is doing its work!