Three things.
First, when you get fast enough, you can reach a point where it is difficult to refuel at the base as you just walk over the area where you can pick up your ammo and energy. Please extend the pickup range for this.
Second, add a compass upgrade to point to the base to make navigation easier in the late game.
Third, it can be hard to hit the lava enemies. Not only are they hard to see with all the pickups, but their hit bot only includes their tiny core and not their legs. Considering you need to get them with about 10 seconds of full powered attacks to kill them, this has resulted in a bunch of unnecessary deaths.