Best steam games currently at or under €30.- ?

Not right now, but from February 2 Rainbow Six: Siege.

Killing floor 2 pretty nice, i can recommend.

Can't go wrong with Grim Dawn or Darkest Dungeon

Rocket League, Doom on sale (although not right now)

All of the good games are under 30€ , except DOOM.

Rocket League

get overwatch, then buy rocket league

If you had that money on PayPal and not Steam Wallet, get the Humble Bundle's monthly.

But since it's on Steam.... Dota 2's battlepass. LMAO

http://store.steampowered.com/app/34900/

Personally, I would wait for a sale and buy Deus Ex Mankind Divided. It was $19.80 i think en Steam store.

With €30 Steam Wallet you can practically buy any Steam game at all, even the most expensive ones are bound to hit a decent value during periodic sales.
If the €30 is in real cash and not tied to your Wallet, you can pretty much get anything you want already.

Mountain

pOKEMON go

ARK: Survival Evolved is pretty cheap at the moment.

BUY FEBRUARY Monthly Bundle fOR XCOM 2 ! )
https://www.steamgifts.com/discussion/SAqrB/humble-bundle-february-monthly-bundle-incl-xcom-2

My wishlist has a ton of good games <= €30

I recommend Wolfenstein the new order, Biohazard HD remastered, Fahrenheit indigo prophecy (new), Lords of Xulima, Banner Saga, Sleeping Dogs complete, Tyranny, and Dungeon Lords Steam Edition (made by a Wizardry programmer)

If I must say one game under 30€ => LA Noire. No hesitation.

Get the game SOMA some day, it's great.

Thanks all for the suggestions so far!
Also noticed that I can get Shadow Warrior 2 for 24 euro (the pack is a bigger discount than the game itself). Thoughts on that game?

Wait for a sale.

Rimworld....unlikely to get a massive discount in a sale too.

Bastion is always for less than $30. Ed: oh, you already have it. Why don't you play it? It never dissapoints.