Thanks for playing and the feedback! The stacked munitions launcher is definitely quite OP at the moment, I'll likely lower the damage or fire rate a bit since it's way too easy to take out enemies from afar with it; it's basically like wall hacking. Enemy artillery units are also planned, I'm already working on a system for certain enemies to call in air strikes when they see the player.
I appreciate your ideas for the powerplant system. It's an interesting way of implementing it though I think it might be a bit difficult to balance the changes to speed due to how fast the enemy's bullets are currently set up so you can dodge incoming fire. I do think different armor types will make it in with basic effects like health regeneration, and a random chance for bullets to ricochet without counting as a hit. If you check out my latest progress report you'll see I've been working on an APS system for the player to stop incoming missiles and mortar rounds; I didn't think to bundle it with the armor kits before but now that you mention it it might be a good idea.
Thanks again for the ideas and feedback! I'll keep them in mind.