[mnw21cam]

In England, it's more the case that the castle survived because the occupier didn't do anything to annoy Cromwell.

[goodcanadian]

Indeed, Cromwell tried very hard to destroy castles. The trouble was that they were very hard to destroy. Most of the ruined castles are not in that condition out of neglect; that was simply the "best" they were able to do at destroying them. Eventually, the cost of gunpowder was just too much to continue that campaign.

[KineticLensman]

Yes. Like Corfe Castle in Dorset, which was taken by treachery, and was demolished some time later, when the fighting was done. [0]

[0] https://en.wikipedia.org/wiki/Corfe_Castle#Post-medieval