took the liberty to change it for you and also commented it
download Definitive_game-Copia-updated-01. capx
i didn't fixed the bullet of player problem, just the enemy, for the bullet of enemy u have to separate the angle of motion set... on 3 distinctive condition layered as bellow
Main>>>bullet on created
sub 1 >>>> character is mirrored set bullet angle to 180
sub 2 >>>> character is not mirrored set bullet angle to 0
sub 3 >>>> if W is pressed set bullet angle to 270