Just tried some other options and received the same ending...no wonder. Because I was as nice to the dragon as possible. I'll probably won't receive other endings which are left because my attitude towards dragons prevents me from any offending or bad choices and I just can't be evil. There's probably one more bad "evil" ending as it was in Angels with Scaly Wings which I of coure never received but I still wonder what I need to do to receive "Good Ending Two" if there is one.
And to the author - THANK YOU VERY MUCH, I adore any dragon-centered games and visual novels, there aren't that many of them and you gifted me with happy evening! Whatever you plan to do next, don't stop. I'd be even buying such games if you release more on steam or here.