That's such good feedback I turned my reply into a devlog.
Two points I didn't address (because they didn't really fit with the theme of the post):
1. I find the vertical ascend/descend controls invaluable around buildings, particularly when negotiating towers. If you can manage without them, I admire your dragon-handling skills.
2. Good point about having some sort of progress measure on screen. I've tried to keep the game view as uncluttered as possible, but I can always make them optional (as I will with the altimeters).
And thank you for the point to Vlad MGC. That'll be something for the next level of release.