Important game update

I had to change several program lines that prevented the use of the pause menu. I apologize for any trouble playing, I don't know how such an important detail escaped me.

other things I work on: artificial intelligence increase of enemies, damage on contact (it will make the game more difficult, but you guys can still beat it) refinement of the repositioning of enemies after a game over (certain levels did not reload correctly)

minors update of gameplay.