If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Who’s a good little Slime Slayer? Awwwh. Yeah, jump into the world of SLIME SLAYING! Grab your sword and for no reason at all, stand in one spot and wait for these little pixel slime blobs to attack you. You must defend yourself with some huge epic sword of defense thing. Good luck!