Overall: 3/5, reasoning? Decent gameplay and porn, but all of it is missing just a bit, keeping it from being a 4/5.
This will have spoilers in it.
The gameplay is pretty good. My main gripes come mostly with reeling in fish when at max load, and the randomness of some of the jellyfish patterns, especially when it comes to the last stage. The spikefish that swim upwards in the big jellyfish formation is really annoying, and since for the last girl you need to use the penis lure, your basically have to restart the game unless you wanna go through 2000 meters of fish. You're never really going to need to use the penis lure during normal gameplay since by the time you've bought it, you've likely upgraded everything else at least a few times, so I don't see why id doesn't have armor like the bell-shaped lures, nor can't it drill through stone. Makes more sense for it to be the amalgam lure rather than what essentially amounts to a hard reset if you touch the wrong fish.
As for the hitboxes, pretty accurate, though I find the eel hitboxes are particularity annoying, as are the anglerfish ones, though those I encountered so little I'm not sure if I'm just imagining it or if it's the frustration of the final dive that got to me.
The animations are good! But it feels weird to 1: not have any cumming animations, and 2: not have any blowjob sounds. There are only 3 blowjob animations in the game, so I understand why they might not've been included, but it seems weird to use the normal sex sounds when they're sucking you off.
As for glitches: there's a few.
After you get grandpa's treasure, ALL of the songs overlap, meaning that the music's garbled, off-beat from eachother, and really annoying.
If you skip to 800m or below, if there's a dark area, it'll be fully lit, but if you haul them back up, everything but the player, the options and the background will be black until you close the game.
The dildo appears to be a rose. You can still capture the girls, but it's a bit disorienting.
You can't get to the Misc (and boat, according to some users) options without using your scroll wheel.
If you catch the gold variant of a fish before the normal one, it doesn't go into your encylopedia.
The nets SAY that they get bigger, but don't seem to? Might just be me not realizing the size increase.
Even if the gallery is fully unlocked, you can't always see the animations on the title screen (for example: I can't see any of the final levels' animations from the title screen.)
Not eggrgious (other than the scrolling one), and they all have simple fixes, but they do still get in the way of enjoyment sometimes.
So yeah, 3/5.