I have now added the third game in the series. More coming soon. Additionally, I have created level leaderboards for both 2 & 3 (1 does not have numbered levels).

EDIT: On the official website (or the next best thing, http://www.fireboynwatergirl.com/ ) The Ice Temple is labeled as game 4. The game has been updated to reflect that, with The Forest Temple Again added as game 3.