Hi Nullify, I'm sorry to hear that your game had to be shut down. I played it in early 2020, but sad to see it's gone from vk.com now.
I have a question though and I'm not sure this is the right place to ask but I don't know of any other way to contact you. One of the tetris mino skins, the swirly one, меандр, was from the game Мастер Тетриса, no? Since you are the only one who seems to have that asset, I was wondering if you still saved the .swf flash file of Мастер Тетриса from vk.com. Now the game is gone also so I'm thinking maybe you are the only one who still has it.