Quite ok game.
You cannot have sudden air waves ignoring the path without any kind of notice. Changing the speed is not very intuitive (and it's needed as 1x is too slow).
Congratulations! You just won the Precision Demolition Badge and 30 points!
Took some time, but once you finish every castle and get the super bomb it's only a couple of really tricky castles.
I did 23, but had to juggle :/
If you make two paths and block one when the creeps are close to the exit, they will turn back and walk the other way. Then you can sell the tower blocking the first path and block the other path.
Hmm, done the full story line and every challenge (including the bonus levels) but still says "Best so far: 17."
Annoying. I'll give it some time to sink in and then i'll have to be clever.