Thanks for the nice feedback :)
Yes, there is basically no reason for the player to move, we did not manage to implement any system to do that. We thought about something like a wall of doom that forces you further to the right every turn, or making the enemies remember where they got shot at from, forcing you to move to another position after each shot. But we only noticed the issue too late into development and then the time was up. Learned our lesson for the next game jam :)