Deli Interactive recently released their Public Domain Jam 2 entry, Lair of the Morlocks. You play as the time traveler from H.G. Wells' classic The Time Machine, exploring a Morlock-infested cave system in search of your stolen time machine.
Deli Interactive co-founder Nick Lives also posted a Gamasutra article explaining how the team used the Public Domain Jam as an opportunity to take a brief creative break from their primary project (We Need to go Deeper) while still ensuring the work they did for the jam could be rolled back into that project in a useful way. Check it out here!