It's cool
The main reason why I'm giving this is a 10 is because you're from Poland. I went there almost five years ago. Wow, that long ago? Damn, seems like it was yesterday! Anyways I spent two whole weeks in the lovely town of Krakow and I gotta say, it sure is a beautiful place. There's a lot of nature there, like that huge park forest. Man it had cliffs and shit. I'll never forget it, it's a shame I didn't capture many photos. Oh well.
Now about the game. Like many flash games these days it had that retro NES style going on. I'm not a huge fan of that, but neither am I giant hater. Some might consider it generic but I sure as hell don't. The simple chip tune benefitted the relaxing atmosphere of the game which is good, obviously you weren't aiming for an action paced shooter, heh. The control were well crafted. There may have been a few glitches, but you probably went around them. It took me a while to realise that pressing down won't throw the Kulkis downwards but simply slows it down. Should've read the instructions I guess!
All in all it's a convivial puzzle game, and I had much fun playing it :)