Pretty good. try to make the drill hole small. i will judge on:
Speed
Effeciency
How small the drill hole is
P.S. i should make the Earth harder to drill through. trying to make it now: it's called Drill comp V2. there is more earth now. space for drill is also smaller.
On v2, it'll only go as far as the LCRY layer and it makes a complete mess of the first 4 or so layers. Also, it's quite slow so I might try again with different elements. Is more than one entry allowed?