I didn't quite understand how to attack. The instructions next to the game showed spacebar as attack, but it was just jumping. Maybe I'm stupid, that's possible too haha. It was also not super clear what the walls did. I expected them not to allow enemies through, but they were free to move around them, so I was confused.
I'm guessing that the game is inspired by Kingdom Two Crowns, but I've never played it myself, so maybe that's why these mechanics are not clear to me.