Simseeder

Simseeder is a traditional 2d tile based roguelike, online with a persistent world. It is set inside computer simulations, where players start at the root, level 1, and must find seeds to get to higher levels.

This game is as sandbox as I could make it, but not in the traditional survival sense (you won't have to find flint to make an axe, there is no flint, or axes, or opposable thumbs): the world starts pretty much empty, except for the spawn area, the simulations are not built yet, only creatures spawn everywhere. At the beginning there is nothing else to do but kill these creatures, collect their materials and then it is possible to build. The unique feature is that players can also make new objects / plants / creatures, there is a pixel editor, and a simple editor to create a behaviour for each (just a list of instructions, executed in order).

Players progress by killing creatures and absorbing their form, which allows them to shapeshift. Creatures also drops the abilities that are part of their program, players can mix and match them.

This game is in early alpha stage, any feedback is warmly welcome (there is a button in game to do it, or report a bug, I read all entries!).