I'd love a downloadable version! I'm still yet to complete it after 4 attempts. I'm not sure what the coral deposits do, I couldn't figure out a way to mine them. Apart from that, this is one of the best LD46 games I've played! There are so many wonderful ideas here, and such a good art style. If I were good enough to, I'd love steal a lot from this. The increase in difficulty feels fair, even though I've still not managed to beat it. I love the struggle to save up for the toilet while also having to use the same resources to just stay alive. I also love how you're trying to keep your cogwhale alive (by the way I love the word cogwhale), but at the same time, you're doing damage to the environment around you - that's a nice take on the theme.
I do have a couple of minor nags though: * I found the camera to be quite awkward, especially since it zooms in when I want to buy things, causing me to miss the arrival of jellyfish until they'd already started attacking. * It's part of the same problem with the camera, but I wish the heal and shoot buttons were either on the HUD or bound to dedicated buttons. Or, as @hectorid mentioned, have an upgrade to make them automated. * Maybe have some way to gain more workers, or to partially automate each room without any workers in it. You could have an upgrade that makes the room produce very slowly with no workers in there, that way you don't end up pausing progress towards the end of the game while just trying to survive - that became a bit of a downward spiral since I had all three workers healing, shooting, and only one left over who had to spend half their time producing energy. Production of coral or pearls ground to a halt, so I was getting more and more enemies spawning but had no way to upgrade to counter them or complete the game. I'm sure I could plan better to win, but it feels a little too unforgiving.
Anyway, I absolutely loved this game, it's exactly the sort of thing I wish I could make. Great work!