hello! I may be a little late, but I absolutely love this concept and the game. I know there are a lot of cool ideas already suggested, but I hope that these are worthwhile:
I’ve seen a few notes on the overdrive, I think that there’s room for a unique mechanic tied to it. What if you can select to shunt the extra power into a different system, slowing down your sprint but giving a different advantage. For example, a passive or active cloak; passive being a visual cloak that stops enemies from detecting you, but lets radar guided weapons still find you, Active cloaking being a jammer device that lets them know where you are, but makes missiles go haywire and reduces their general accuracy.
I also have some secondary weapon ideas. Different missile types, unguided rocket bursts, a fully guided missile that requires you to lock on, bunker busters that go through buildings and explode. I also have seen the mortar idea, but I think an orbital weapon that detaches your camera for a short range, and allows you to fire tungsten rods from space would be cool. Also maybe an emp?
Ammo types? Explosive, flechette, incendiary. That might negate some weapon types though, but it would give ballistic weapons like the auto cannon more flair.
I think the stealth mechanic could be greatly enhanced by giving certain enemies(like the tanks) directional armor, which is what I thought the third missions prompt of flanking meant. It would help some missions make you choose stealth over guns blazing.
I assume there will be different mission types, but I had the idea that you are given a picture of a car, and you have to blow up that one target. However, the car is driving towards a bunker, and there are multiple enemy units in the way. A kind of interception mission.
well, thank you for reading this. Again, I love everything about this project, cheers.
(P.S, I completely understand if this is a personal labor of love, but you did mention customization sprite work issues; I would love to help if I can, I have a background in game design and animation. I am not a professional. I am a pixel mech enthusiast. Regardless of whether you accept my offer, I wish you all the best of luck, this is literally one of my favorite games now, even though it’s not even done yet.)