Hi, I tought that maybe you are interested in the demo of this game that is heavly compared with Portal:

steamcommunity.com/sharedfiles/filedetails/?id=182738655

Its not nice to advertise something that you made - especially if you're asking for money.

Hmmm, I don't want to annoying, but right now I'm not asking for money (the full game is not realeased jet, and the demo it's free).
Also, in these boards many people promote their own creations, this is a hard worked creation that I'm offering for free.
Ok, it's not Portal, but that's why I posted it in "General Off Topic Discussion" instead of "Community Releases".

I think it's fine, as the game seems Portal-inspired. And it's on the off-topic board, after all.