If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Exit the cavern without ruining your shot in Above Hell! Reach the exit by filling the room with the blood of your enemies to float higher onto your raft. Do not forget to collect health packs dropped by your dead enemies and shoot at flying hearts for extra lives. There are pills that can used between levels to improve your health, damage, and reload speed. Good luck!