I played a bit. From the start I would randomly get black squares showing up in place of the water, and even blocking the ship. Eventually much of the screen was black.
After a bit I saw the enemy ships in the distance and the note to press F, which I did, and headed towards them. I tried the various controls listed at the bottom right and then tried space and clicking the mouse to fire, as that was not listed anywhere I saw. It took a few tries before I noticed the smoke from the guns to indicate they were firing. It took longer before I acknowledged the targeting icons changing from a plus to a progress circle after firing to show the cooldown. While the indicators do work once you know to look at them, they are small, and with the guns not making any sounds when they fire, if you miss that they fired while looking for what buttons to press to fire, it can be a bit problematic. It would help if you added mention of using the left mouse button to fire, along with the reticle icons changing to show the cooldown before you can fire again. Adding mention of the various guns you have and that they may have different ranges and cooldowns would also be helpful. This can be on the game page to start and does not need to be in game yet.
I played twice. The first time I was messing with things and learning some of the controls. Eventually I think I was destroyed as there was a lot of red, but the screen was also very black by that point. I'm not sure if I ever hit the enemy as I had not noticed the enemy health numbers and was mainly focused on learning how the firing worked. The second time I paid more attention to the enemy ships and that is when I figured out the targeting reticles showing the cooldown and also saw the enemy health. That time I was able to take the first ship down to 0%. I then had to press F to unlock the target and again to target the second ship, which I was also able to bring down to 0%. While writing this comment I went back and forth several times and eventually saw some stats, including the 2 ships sunk, popping up when I moused over the Resume option. It would be nice if those stats were always shown on the pause screen, unless there is other data that needs to show. Currently nothing else shows up, so having the stats there always would be nice.
I think the next thing to focus on would be improving the basic user experience so people can play enough to give more feedback. This is largely what I mentioned above about giving more details on how to play. It would be nice if the enemy info was easier to see. Perhaps adding a HUD with info on the targeted ship. Simiarly, a HUD showing your weapon cooldowns more clearly might be nice, though once you know what to look for it is not too bad as it currently is. Adding firing sounds, or making the guns firing more obvious could also help. Once the basic UI/feedback is in place, I'd work on the shooting a bit more to give more to work with when working on the strategy.