These ideas might not be put in the game, but why not?
1. giant mobile base, Remember that huge car from halo 4? we need that in astro. you can walk around in it while it moves and it protects you from storms, you can also hold cars inside and you can exit through big doors. This thing would be massive, just like the mammoth from halo. glass windows, the whole shibang. This would also be unlocked super late game. you need 100 titanium, and exotic materials.
2. Exotic materials. Every planet should have a special rare element that is uneque to that planet.
3. Spaceships. a massive frigate that could be as big as the mobile base, but in space. 350 titanium, 300 exotic resources from each planet. would need tons of hydrozen (100 per hour of movement) and could launch small spacecraft from its sides. could go to any planet and does not use fuel while in orbit. It will need energy that could be gatherd from big solar pannels on the outside.
4. Better starting base, dont get me wrong, i love the improvement. but the base should have an interior, the camera should be on the wall so you can see yourself while walking inside. you can also wait out storms by sleeping. it is better than fiting just one person inside, if you play with friends you can have all 4 of you inside at once
any other ideas?