At Voiceflow prototype it works perfect.
I have uploaded the project to Alexa Developer Console (also tested in alexa app device), but nothing works nice there.
The main problem is that it cannot enter all the intents.
How could I proceed?
I think that the reason was about faults in the intents.
Try to submit your skill for certification to Alexa, after this you will get an email if there are any errors in it. That email could be useful to identify the problematic intents.