Played a bit of the original quite a few years ago, and now that I'm better at games in general and 2.00 is out I've played through quite a bit of this new version and am loving it. This has to be one of my favorite h-games, the animations and CGs are generally good, the gameplay is great if maybe a bit too hard (normal difficulty feels a lot like Hard on the RE2 Remake) and it has a very interesting premise.
Two things bugging me though. The first one is that on Level 2.5 the tree monsters feel like total bullshit, they have a ton of health, are about as fast as the dog-like monster, the first portion of their grab is impossible to escape meaning you're guaranteed to take quite a bit of damage if you get caught naked and to top it all off they're invincible unless they're moving or have already started attacking you. Literally the only way you can beat them is to either use a Molotov and then turn around and let them run into it or let them hit you at least once and then pump an entire clip of bullets into them. If you could hit them while they're frozen pretending to be part of the background they'd be more manageable, but as it is now they feel like BS.
The second one is something I feel like was missed potential, but probably won't get changed. The game recently got ported to Steam so it's not impossible, but very unlikely, that being I think the h-animation for the 2nd boss could be improved. The boss is designed with 2 dicks, a smaller one higher up and a larger one below, but the large one doesn't even get used. It just cums outside of the protagonist at the end of the animation.
For the portion where she's against the wall I feel like what should happen is at first both dicks are just being rubbed against her, the larger one rubbing her pussy and the smaller one hotdogging her ass. Then the large one would enter her pussy part-way while the smaller one keeps hotdogging her ass, and finally the large one would go in all the way and the smaller one would penetrate her ass. The close-up we see of the top dick rubbing her pussy would be replaced by a rear view so we can see what's going on.
Edit: Managed to get past the section with the tree enemies by the skin of my teeth, and that made the next section of level 2.5 almost as frustrating because even with full armor I would die in 2 hits. Now at the boss and it feels almost as unfair as the tree enemies. The enemy Flower-headed Giant's Knee Charge can cross the entire screen and has basically no wind-up, how in the hell are you supposed to avoid it? And when it's below half health in its 2nd form it has so many hitboxes that you can barely attack it at all without getting hit.