[Update]: While a lot smaller in scope, the Serious Sam spin-off rogue-lite Tormental has now also been unleashed.
The freshly released Serious Sam:
[Update]: Serious Sam: Siberian Mayhem has now arrived, and so far it's looking like a shorter and slightly improved version of Serious Sam 4.
Developed by a group of
[Update #2]: Serious Sam: Siberian Mayhem has now arrived, and so far it's looking like a shorter and slightly improved version of Serious Sam