Weapon Alpha

[Valo]

game maker has always had terrible compatibility issues from version to version, the change so much in gml a lot with no reason whatsoever.
also a note, you're probably better off in a palette swapper passing in a group of vec3's as palette and determine the colour by the w component, which you can decompose and edit in pretty much any good image editing program.

You wanna repeat this bit in english?

back on topic, how many animations are you looking to use underwater? because you have a lot more freedom with textures than you'd think, adding a new set wouldn't be much of a cost short of HD sprites

off the top of my head:
Idle
Move
Idle shoot
Move shoot
Propel forward
Propel forward shoot
Hurt
and Drowning