Desura was bought is now One Play apparently, http://www.oneplay.com/en/
On Desura you used to be able to just publish your game. It was like an open smaller Steam type.
There is also PLAYISM http://playism-games.com/
Be aware that publishing your game on Steam will cost you the greenlight free until we get SteamDirect this year. And that will involve money as well, probably more, we'll see.
Also, why I completely understand and agree with everything you said you should be at least mindful. If the game is bad it might tarnish your name for further releases. It can go either way.
You may wanna publish this one under another dev name than a future better one.
There is also the argument for no such thing as bad publicity, like I said it can go either way.
Believe it or not, in this world where we are oversaturated with games and all mobile games are free, you have to fight for people to play your game, even if its free. People have too many choices and time is money too.
So dont expect tons of feedback unless it is of quality and you really push it.