Still doesn't work. I also tried resetting the save file, and it's still broken.
The vapor plasma in deep town hides on the big room to the right seems to be broken also. It won't go away after you pick it up.
Hm okay, that's weird. Does it just not fire when you try to use it in the air? Maybe reset your control bindings or something.
I'll check out that vapor plasma issue though as well, thanks for reporting it.
I figured it out, I was using the jump button, not the move up button.
cool, thanks for letting me know!