I really like the concept behind this. The main thing I think needs a tweak is the timing. The time it took to drill, and the gap between being able to move took slightly too long IMO.
Also, my screen was too short to see the bottom of the screen, so it took me a while to realize the drill had warm-up. A full-screen option would be handy.
I liked the graphics of the over world (outer vacuum?), and the spinning and sparking animation on the drill was well-done.