Excellent, as usual
I found the second part to be more "user-freindly" than the first with respect to pixel hunting and overall plot development. A nice minimalistic design with appropriate sound coverage and involved game-user interaction. Introducing coins to be found was a good move, as it seems to have spurred on many-a-person to go looking for coins and get them all.
Admittedly, to fully appreciate DM2, the player ideally should be well acquainted with DM1 and the submachine series.