Your game still continues to inspire me a great deal, I love how the crabs look when they're in a group and reacting to being hit, it looks really lively.
If I can throw out a weapon suggestion I would say a delayed explosive weapon,so when an enemy is hit others can catch up and be caught in the blast. One more idea; perhaps a biotech based weapon, a kind of "atomic breath" plasma emitter that acts as a alternative to the flamethrower, still ignites things but doesn't linger on the ground, but starts up faster and has a wider radius.
Looking forward to seeing what happens next!
(P.S that cockpit view cutscene looks gorgeous)