If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Test your skills against bosses who adapt to your gameplay style.
Climb the tower and fight boss after boss to reach the top. Each boss learns from how you play, gaining new abilities and becoming stronger based on your playing style! Dash and jump to avoid attacks, or wall jump to gain an advantage. You might even try to outsmart yourself!