After playing level 11 again I discovered that it's possible to clear it not the way I expected it to be cleared. So there were too many items (one bird too much, which is removed now).
I just saw that the full version has been purchased (twice!), although the Lite version is full >:o which is strange but good =D. The full version was still the old 1.1 because I thought no one would purchase it anyway so I didn't care to update it. But now it's updated.
Should be a commenting feature soon, so check back for updates!