Thank you for playing the demo!
Watching you play it was very helpful. You can't interact with stuff while you're in combat, a notification for which I completely overlooked.
I pushed a quick hotfix that gives a little more feedback for combat.
The scribbles try to stay outside of your combat range and move in to attack then move away, most of your hits were falling short of hitting them. The new update made the players attack hitbox bigger so it should be easier to take them out now.