The third level is now done. Enjoy the screenshot! Progress on other levels is going well; I expect to finish levels 1 & 2 in a couple of days. Level 6 is the most unfinished level at the moment but also the biggest in the pack.
If anyone knows how to make an Osprey trigger something when it gets destroyed, let me know immediately (the normal "Trigger Condition" method doesn't work)! There should be a way to do this (see Operation Nova, for example).