The Indie Royale bundle is offering Sanctum, Ares, Nimbus and Gemini Rue for a knock down but slowly increasing price. It started at $2 but it’s currently showing as €3.67 here. The more people pay the minimum the higher the price, pay more and the price goes down.
I already have 3 of the games so I’m not buying but Sanctum alone is worth the entry fee.
Here’s the obligatory reddit thread.