First - is there an option to watch films on ipad?
Second - is there a chance, that paradox games will be avalaible soon, but not the blizzard one soon?

First - the listed format for movies is MP4, so if iPad can play those then the answer is yes.
Second - If you mean theseguys, this is the only game so far...which could mean more are coming.

mp4 is a native itunes ipad format
so yes

Och, I made wrong question - is there a chance to watch movies online on ipad? But it seems I got my answer, that they are downloaded, not streamed.

You can stream them actually- I haven't tried it, but the option is there.

yeah if you want to stream you need to get a sub on something like netflix dont you need an airstream station for that ?

Are you thinking of something else entirely? Streaming, in this case, is simply "watch the movie straight in you your web browser, without having to download the thing first".

no
we are talking about streaming to an ipad here

air play in other words >> https://www.apple.com/airport-express/#airplay

So, yes, you are talking about something completely different. The iPad has a web browser, it should be simple to log in to GOG, visit your library, and stream the movies from there, just as you can on a computer.

SHOULD
doesnt mean it is

it never is that simple

Not that the library interface is optimal for a small-screen device, but it works quite fine on my Jolla and on my work Android phone, so I can't see why it wouldn't work on an Apple device.