Hey, for the Zoltan-napalm shotgun sprite sheet, there should be extra frames where the weapon's barrel is 'retracting back up.'
Since right now the barrel goes all the way down, then suddenly pops back right up -- which looks very sloppy and jumpy.
What I would normally do is to copy the firing frames (except when the barrel is fully down),
then paste them in INVERSE order. Also, you're missing a floor image, and the ship seems to be off-centered.
Onto game-play;
It's not a bad ship, but it's ever-so-slightly OP (at least in the context of fighting enemies with actual crewmembers, AI-ships play similarly to the Slug C, albeit without hacking) since a large AoE plus 10 incendiary projectiles equals most of the enemy ship is on fire; which basically made the 5 sector run extremely quick.
(Also, I'm down for helping anyone with weapon sprites/art, just saying 
)EDIT: So, I went out and decided to re-make your Zoltan-shotgun, is that okay with you?
