Thank you faqinhell :) !

Unhappily, it's very hard to me to fix that : actually the background is composed by a very wide gif animation. This animation was made using the level editor of the game Broforce. I created my own level with that special atmosphere which is not present in the original game. I recorded (with a lot of time and camera problems :)) the animation on my level and made some adjustments on GIMP. To enlarge the animation, i would have to create another piece of the scene which means to change my level and then record an animation of that piece and finally put together the old gif file and the new piece, which is practically, very hard and time consuming. If one day i have the time for that, maybe i ll do something but with all my respect, do not expect something certain ;).

Thank you :) !

Thank you Ruan for the comment and the five stars :) ! I would like to create more themes like that in the future but it takes some time ;)

Thank you ! I am personally quite sensitive with my eyes on screen so i tried to keep colors not too flashy :)