I was caught off guard by this one. I saw some cool jelly fish art and stuff, thought it might be an interesting game, but I was blown away. First off, the animation and movement is so fluid (yeah). It was pretty fun to navigate around. The only thing that tripped me up a little was that sometimes it felt like my jump wasn't going high enough, but other times it was fine.
The build up of different types of mechanics worked very well and had a nice pace to it. They were pretty fun to try to master. I did have to stop part way. The green flame that you use with right click didn't work so well on my laptop track pad. I'm going to try playing again when I have my mouse.
The music combined with the nicely lit atmosphere and interesting filter made for a great underwater aesthetic. Well done!