Very cool game, I loved the atmosphere!
Imo the focused shot type is quite OP if you know how to use it properly. I think the big fish should’ve done a bit more damage given the risk you have to take to get closer to the enemies!
Shattering the little crystals is really satisfying, and the patterns are fun to dodge.
The hard mode mechanic didn’t quite convince me, I found a bit annoying rather than fun, but perhaps that’s just me.
Overall, great job!