Suggestions:
1) make an option to view not the whole video but the set period of it by defining timeframe.
- Make an option to set the timeframe to be repeated
2) introduce variables (at least integer)
3) re-arrange buttons disposition - they are too far away and if there are a few they sometimes ...

Lol, I thought Russian custumer service was bad =)

If I have an option to show it to someone without making it public for testing? No, this only avaliable for classic teases.
You can copy your entire code, send it to someone, he/she creates a tease and paste your code in the code window. It will be without pictures (unless you provide them too) but ...