[Free] [Tremorgames] CAFE 0 The Drowned Mermaid Desura key

Well, it's not a Steam key, but you only need to gather 25 Points this time.

Desura store page

Original description:
To redeem this game for 0 Tremor Coins you need to have earned 25 Tremor Coins from offers since Jul 23 11:20 am and your account should be 3 days old

Items Remaining : 463

I'm not going to link Tremorgames or the Tremor Reward page itself.
If you don't know what this deal is about then there's no point in linking it anyway.
If you do know what this deal is about then you know where to look ;)