I finally released Gridworld on Steam yesterday. The overall response seems mostly positive so far, which is really nice.
Working on Gridworld has been really fun and I learned a lot, both about about programming and about evolution. I will still make updates from time to time, especially if some bugs are discovered that need to be fixed.
atleast one bigger update is planned to implement the last few features I wish to add.
Now that gridworld is done, I will focus my energy on new projects. One of those is another evolution simulator, except this one will be in 3d with physics. It will be somewhat be similar to Karl Sims's Evolved Virtual Creatures.