Ooh, that was so cool when the fishes that just have been floating around all swarm and attack. The underwater vibe is nice, very cool that you built it all out of GLSL shaders, it looks nice. I think this type of atmosphere could really benefit from sound SFX and soundscapes to make it feel like you're deep underwater. Also, the initial discovery of the probe could be a bit more of a challenge (if it was stuck in more of a maze system of underwater caves or something), since finding it is just a matter of holding the down arrow, but the core loop definitely has something to it -- another mechanic or system the player can interact with could really make this engaging. Nice work! :)
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Thank you!
I'm glad the swarm attack had the expected effect, I wanted it to be an element of surprise (see my answer to Dender46 for more detail).
Yes I also feel like this type of environment could definitely work well with some ambient sounds, I'd like to try adding some for a post jam version.
The idea of a maze or system of underwater caves is interesting. There could be a mechanic where you have to dive through underwater tunnels that are too tight for the submarine to navigate, but you have to memorize the map with your radar before entering them so you don't get lost.