Thank you for your comments! Actually, in the video above the height floor was enabled. I am totally satisfied with the obstacle avoidance of it. It's remarkable.
Today, I have tried out the keyframes and this is the result. Super fun!
Moreover, I was upset when I tried the "Cable Cam" skill and found out that the minimum speed is 1m/s. This is still too fast to create a hyperlapse. But when it comes to keyframes, the granularity of speed is 0.1 m/s and the minimum speed is as low as 0.1 m/s - it should be easy to create some hyperlapse then!
The only limitation I have for now is a single battery, so my learning curve is quite slow!