You could surely "Polish" it more if you would release it in English :D Excuse my bad pun ;) But seriously: with release only in Polish language, you leave 99% of the players out of your game.
The upload here is strictly for the archives, and for the Polish players (since it's a nostalgia Polish themed game which would make it even harder to understand for anyone else).
I understand where you're coming from, but I currently don't have the time to translate this old demo cause I have so many other projects I'm working on right now.
I don't say it will never happen though.