If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Play Beneath the Waves as a follower sent by the sun to collect the idols together and take them back. Each area requires you dive deep beneath the waves, grab the idols and swim back up to place it on a pedestal. However, the moment you grab an idol, all the surrounding fish will immediately become hostile, and may chase you. The Sea will also show up every now and again to provide backstory.
Left / Right Arrow Keys - Move.
X / Up Arrow Key - Jump.