that was fun! Not sure if it was intended for the fish to lose interest mid-way but it was fun nonetheless (still annoying though. the upgrades I feel like are a bit too expensive early on, it was tough trying to save up and buying them. also the controls, it was hard to control which ship I want to go where. if I use keyboard then I often mistype the number boat I want and if I use mouse I accidentally use flare because I double click them by mistake, trying to move them a tiny bit.
Thanks for playing and for writing this up. The fish losing interest is on purpose: a shoal held under one light too long grows used to it and sinks away, and a flare makes a risen shoal leap before it tires. The game only says so in a short message, so it is fair that it felt like a bug.
The double click on a boat firing a flare while you nudge it is a real control problem. That goes on the fix list with the early upgrade prices and the number keys.