Difficulty is a little wonky. You've got the first screen, which is little more than a tutorial, and immediately after, it's 1 to 100 final boss difficulty, actually trying to kill me with cardiac arrest.
Then, once that monstrosity of a level is completed, the following levels are fine again. Reminds me of "They Bleed Pixels" in terms of level design and trying to kill the player from frustration.
The gif image on this page is very misleading, showing the drill moving much MUCH slower than it actually goes in-game.