I got some things:
- How about changing the default key for entering vehicles to "e"? I think it's more intuitive and easier to use that "enter".
- Add a truck: a larger, slower, more expensive vehicle but it can hold stuff inside, like the cargo container. Usefull for building a new base at a new spot and taking stuff with you to start up. Later you could also add a combat vehicle with more health and a weapon but again slower.
- Helping drone: a flying little drone with (for example) three inventory slots where you can either put ressources to store or tools which the drone will use when you want to mine stuff. Again you could later also give it a weapon.
- Less air leaks please! They are so frequent and soooo annoying!