yeah, i totally understand. it's my first game jam too and i also tried to keep my game as simple as possible.
i obviously don't know anything about your game's code, but maybe you could check if you have some kind of condition that prevents the player from moving when you are inside a fight. like for instance some can_move variable that you set to false when entering combat. i think that could be the problem because at least in my case, the moment i stopped being able to move was right after winning a battle. it was the fourth or fifth battle if i recall correctly.