Interesting concept! haven't played a game like this before C:I couldn't get past level 3, I still had at least one sandcastle remaining... perhaps those smarter than I can get past it!
Thanks for trying it!
A few hints that could help:
- make sure you're using all the points you won, each tower destroyed gives you one. This is easy to miss and I need to work on better visual feedback
- all parts of the wave can destroy a tower, not just the middle
