It's a free to play game?
Yes. The Metro of Shadows is a free to play game. You can Download for free.
Can I download from Steam or Epic store?
I would like to upload the game to Steam, but I need 100 USD to do so.
When will the game be released?
I don't know at the moment. I'm aiming to release a teaser demo version of the game as soon as possible, but I still need some time. As soon as the Demo appears, I will publish it for all possible platforms and here you will find the installer under the Download menu item, for which you will of course need to register.
If I missed something, please write it in a private message!