It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

Steam version includes a level editor and there's no mention of that in the description here, can anyone confirm it is/isn't included here?

P.S. I'm asking about ACTUAL features, not annoying notifications that aren't part of the game.

No level editor on gog version. No success too.
Achievements are certainly an actual feature, and they missing on the GOG version even though the Steam version has that feature.
xmoucheron: No success too.
What is "success", is it an expansion pack of some kind?