Finally got around to playing this, and really enjoyed it. The systems you created (lining up the 2D platforming in the bizarre 3D world, upgrades, seaplane causing portions of the city to disappear, jellyfish controls, etc). I really love the look of the world as well, and Future Cat Sailor is a super cool protagonist. I let the jellyfish awaken once and also returned to my family with some gold in another playthrough, but it feels like there is more to find and do.