How heavy the game is?

It depends on the version you are going to download.

In the Discord, there are two versions of the game, those being 8.0 and 7.9.

8.0 weights 1.38GB

7.9 weights 2.45GB

You are likely wanting to get the one that weight less, but hey, if you are curious, you can choose the other, but either way it's up to you.

Both versions have support for Screen touch, but also native support for keyboard and mouse. I am aware that this culminates the whole point of a mobile game being mobile, but it's completely optional which way you want to play.

Unfortunately, there aren't any servers other than Brazilian ones, but that doesn't mean you can't host them as well, and gather friends to play a match.