The quest display is always in the way, obscuring the data from the detector. This must be made deactivatable.
6 slots are not enough to be flexible enough, this should be increased to 8 or 10 slots.
For the tools, there should be some kind of crosshairs or a point that shows the starting point for its effect.
Objects from abandoned bases should be made usable. For example, you could reuse gas cylinders for extra storage of O2 or water by emptying, cleaning and refilling them beforehand, or you could make crates collectible and modifiable to function as a transport crate for the quad, but with less storage space.
It should be possible to replace the batteries of small vehicles like the suit, in order to be ready for use again more quickly.
On larger vehicles it should be possible to install a small solar panel to reduce energy consumption during the day.
The emergency supplies in the vehicle should be made refillable.