Thursday and Friday
I couldn't work a lot in the game on Thursday. However, between both Thursday and Friday I managed to finish the core battle system of the game, including aggro, healthbars and character controllers.
My next steps will [probably] be 1) creating the "invasion" system, which will handle the appearance of enemies (timing and locations), 2) creating the rest of the game art, 3) adding effects (when something hits, explodes or dies) and adding some sfx and music.