this game is surprisingly replayable, considering months have passed after the last time i replied to this, so once again here are some ideas
- endless mode
simply put, you fight waves after waves of enemies, each wave harder than the last. however, while the arena is quite large, the terrain shifts between waves. maybe this could be added as a training room for crawler pilots? unrelated note, since we are speaking of terrain,
- actual terrain in missions
considering mars has quite a lot of craters, riverbeds, sand dunes and more, it makes some sense that there could be places where the terrain has multiple parts with different elevation. this could make for some good fortresses, especially with minotaurs and turrets in a crater holding an objective, though i dont exactly know if the game engine would allow it.
moving onto the crawlers themselves, it might just be me, but the crawlers do look like tank turrets on legs. maybe it makes sense lorewise that they have either a multi-crewed variant for co-op play, or one made for troop/item transport? after all, APCs and IFVs do exist, so maybe they can be enemies?
last but not least, a new secondary weapon could be fun.
- the air/orbital strike
by launching a marker, the air force or navy would be alerted to call in support either by conventional bombing or kinetic bombardment. for obvious reasons it wouldn't work underground, but above ground this could be very capable of damaging any static enemy. for balancing, the enemies could either move out of the way or attempt interception of the projectiles, possibly shooting down the jets outright as well.
anyways, i'm just gonna leave this wall of suggestions here, might go back to replaying the campaign again
edit: i reread the intel of the MBTs in game, and it appears that they are significantly larger modern MBTs. how big are they compared to modern tanks?
edit 2: regarding the co-op idea, i should probably clarify, the driver can operate the weapons normally in singleplayer, but more often than not the driver does get distracted by combat and can get stuck in terrain, resulting in hits that otherwise could be avoided. also, maybe add some reward for S-ranking a mission?