It probably is difficult to balance, but I'm not even sure I'll have a complete game by the end of the challenge, because my past 3 days weren't productive at all. I'll try my best though, there's still 1 and a half day left.
So now I have enemies that sit in one place and take damage, and 12 weapons, each with its unique property. Like an axe which deals damage to all surrounding enemies, burning spell which only damages the enemy at the end of a turn, or a spear which deals damage based on how many squares the piece travelled before attacking.