My review is going to be a follow up of Matrixatp's review as the stuff he stated, I noticed too, but I would like to add on to his list of problems.
Loading the game for the first time, you are greeted by very loud menu music. when adjusting the in game volumes, I noticed none of the volumes changed anything until I created a save file. This meant that in order for your settings to take place, you need to go through the lengthy (un-skippable) intro until you reach a checkpoint (auto save).
During this intro, as Matrixatp has mentioned, it is started off with a comic-type screen that you need to mouse click and drag to go through (which is a bit buggy). You're then you're met with a black screen that has mostly no voice lines, asides from the Chinese voice line, the rest is just played out by subtitles at the bottom of the screen. All of this in the intro for the tutorial is un-skippable.
The second lever you pull to get across the gap is covered in a slime, this is a misleading part as you get no text or prompt telling you to head back so a cutscene can play revealing your first weapon.
As you walk through the level, all there is, is background music (which I prefer to play without) so everything is just silent. This is until you go inside the cave, followed by another un-skippable cutscene, in which you will encounter your first real enemy in a short cutscene. As the game had been completely silent up until this point with me playing without music, as soon as that enemy cutscene had ended , I was jump scared by battle music that could not be turned off.
Having to constantly hold E on prompts, just to crawl through a dozen tunnels, made me lose my interest quickly as it then told me how slow paced and boring the experience was going to be.
And now for the H-content, the first scene you come across is in the tutorial stage. This part confused me the most as its not exactly clear what you do in these scenes, it seems like its integrated as a type of fight mechanic. you have a few positions, rhythm matching and struggle mechanic to do along with two abilities you can use in this situation. The animation is fairly decent but as this content is what we're all here for, I can say that its not worth getting your hopes up for until further updates.
With all that said, I believe there is room for improvement as it is only Version 0.01. If the Dev decides to stick with this project instead of abandoning it after 3 update like other games I have seen then I think this would be a decent project to keep an eye on and support.