I was bored and just decided to buy this. Played through the whole game in one sitting. Brad was right - they mix up the Mr. Driller Formula in really interesting ways. Has a good sense of humour and style as well.
 
Only gripe is that it is a little bit short with only around 60 levels or so. I would have liked to see maybe one final *hell* chapter where the puzzles are a lot more deviant as most of them were a bit too easy.
 
Loved the game though and highly recommend to others.

its also a bit hard king raskull wasnt joking when he said that the side levels were hard :p

I found it a bit too easy tbh. A couple of levels stubbed me for a few tries but most of the game is a bit too straight-forward.

In my option short games is refreshing now and then, if the price is reasonable that is

I felt like it was the right length. I was kinda sick of the game by the time I got to the end. The timed events really felt like they were asking me to stay on a certain line with no room for experimentation. 
It was fun but it just asked too much for its controls.