Very fun, but the demon head's seem broken. Unlike the bows that target the nearest enemy, the heads seemingly don't so they end up facing away from the path. Didm't expect the slime and spikes to decay with use, but I like that you did that. Lastly, you seemly want it to be a constant barage of eneimes, with using the portals to move, but maybe a small grace period every ten rounds or something.