Not sure what this has to do with growing or 2 button controls for a start.
The level design is boring, the mouse movement is floppy, the mood is repetitive and the enemies are unchallenging.
There is no health bar, so I don't know how well/poorly I am doing. There is nothing to suggest what kind of vehicle I am actually driving. (A rover could mean a car, but then why does it handle like a spaceship with a laser-gun, and if it's a ship, what is the need for elevators)
Sadly un-fun to play on account of long corridors, unimaginative visuals and sluggish gameplay.
Reminds me of the kinds of "games" I made in the first 3D engine I could get my hands on at the age of 12.
This might have really worked if it had been retro-styled to look like Hovertank or Catacombs with some cheery sound effects and enemies and some backing audio to set the mood.
Not the worst compo entry I've seen however, it was at least a game, with a beginning, middle and end, and I did manage to complete it. xD