Zeno Clash: Ultimate Edition
Zeno Clash: Ultimate Edition was released in 2010 for Xbox Live Arcade. It was an updated port of Zeno Clash with new characters, attacks and weapons. A co-op mode was also added to the tower challenges. The original Zeno Clash was built on the Orange Box version of the Source engine but Zeno Clash: Ultimate Edition was updated to run on the Left 4 Dead version of the Source engine (https://www.siliconera.com/zeno-clash-ultimate-edition-detailed-by-ace-team/).
The new character Raganee and the new roothammer, shotgun and skullhammer weapons were modelled by Luis Santander.
There were plans to bring the changes back to the PC version of Zeno Clash but this was never done: although it was intended, ACE Team likely had to abandon the update in favour of continuing development on their upcoming game Rock of Ages.