In short, multiplayer lemmings with an editor.
Clones is a puzzle/real-time strategy for the Windows platform, released on November 18, 2010 on the digital distribution network Steam. Clones was created by independent game developer Tomkorp Computer Solutions as their first game. It features alien creatures named clones to which the player can assign a variety of morph commands which cause the clones to deform their body in order to navigate the terrain. Multiple game types are supported as well as both singleplayer and multiplayer modes.
Clones is to Lemmings as Unreal Tournament is to Wolfenstein.