I liked the concept and the music. On my first run I died within a minute to a fish that was offscreen when I placed the first speaker (just to see what it did). Second run went really really far, and I was surprised by how massive the map is. I don't think the size of the map is a positive unfortunately, since it's the first map and I had no idea how much further. I died to a random fish in a corner after like 15 minutes which was very frustrating.
Fish are difficult in a non-fun way imo... They should either die or at least stop for a while after doing damage to you. Especially with the huge map, it's crazy that I would die in under 5 seconds after 15 minutes of searching. Other than that, the speakers were not particularly useful, in fact they seemed more dangerous than useful. I only used a couple as breadcrumbs since there are very few landmarks in the game, everything kinda looks the same. If they had like 5X their current light radius, that might be something to use strategically. They're barely brighter than the sub and don't move so they ended up being useless imo.
Anyway, very well done for the short time of the jam, and I hope this feedback is helpful!