Now you can compete in your katana skills with other players: after each level you'll see TOP 5 players, and your current and best result. Score is based on you time (less is better), but for every enemy left alive you'll get penalty points (their experience reward X 10), same is for taken damage during the level.
I will daily monitor leaderboards to prevent cheating until I automatize this process. In case of changes in level-design or balance, or after new feature added - I will reset leaderboards entirely. It would probably happen frequently during the Early Access, so don't get too attached :)