Annelids is described as 'Do battle as a worm in single player matches against smart computer players or online in deathmatch and other modes in fully destructible, procedurally generated underground environment'. There are nine games similar to Annelids for a variety of platforms, including Windows, Linux, Mac, Steam and Android. The best alternative is Teeworlds, which is both free and Open Source. Other Annelids like games are Soldat (Freemium, Open Source), OpenLieroX (Free, Open Source), Cortex Command (Paid) and Boring Man - Online Tactical Stickman Combat (Free).
Teeworlds is a free online multiplayer game, available for all major operating systems. Battle with up to 16 players in a variety of game modes, including Team Deathmatch and Capture The Flag. You can even design your own maps!
Soldat is an exciting unique side-view multiplayer action game. Played by hundreds of players at this moment. It takes the best from games like Liero, Worms, Quake and Counter-Strike and gives you fast action gameplay with tons of blood and flesh.
Cortex Command is a 2-dimensional side-scrolling action game developed by Data Realms. In the game, the player takes the role of a disembodied brain, who controls various clones and robots to achieve his aims.
Battle other 2D stickman online while jumping around like a lunatic and getting blown up into smithereens. With 70 weapons, Boring Man is the most chaotic and hilarious 2D online shooter on the internet. Fonte: http://store.steampowered.com/.
Armajet is an accessible, free-to-play multiplayer shooter designed for mobile that pits teams of players against each other in fast-paced jetpack combat. Players compete in a modern arena shooter that’s easy to learn and hard to master.