Hi! Thanks for the video, it's much appreciated!
About the fps drop, we are aware of the issue and are working on it actively, also, this game started as our graduation project and we are planning to continue working on it and add new features, there is more information on our devblog : http://flux-game.com/
About the "jellyfishes", you can actually have more by popping bags (a bag appears when you move the camera outside of your network, then you can make your creatures move around it to make it pop and release new creatures.)