The game has received some updates. The special technique that you activated with the button K could sometimes block itself and this would hinder considerably your experience. The special technique "Goro domain" is now fixed. The challenge mode had a bug that would cause the challenge to stop when reaching 100 ennemies spawned. Now it is no more the case, the challenge will stop only when you have eliminated all ennemies. When you finish the challenge, there is no more superposition of UI and the main character, the game will then sent you to the main menu. More updates will come so stay tunes. The dev.