Please, report technical problems or issues here. Please provide a detailed description of the problem so that I can fix it
Device name The-Epicenter-Of-Electricity
Processor Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz 3.10 GHz
Installed RAM 8.00 GB (7.90 GB usable)
Device ID 171347DD-3864-4E21-9E4A-E2C917D170E4
Product ID 00330-75061-96318-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display
Your system looks good, but what is your GPU card (graphics card)? This might be the most important thing which causing black screen from start. You can download completely free and very popular app GPU-Z https://www.techpowerup.com/gpuz/ it will show very much info about your video card.
You can try to download 'Windows_NoFullscreen_version.zip' from the download section now. Maybe this one will work.
Also, I have found forums where people discuss how to fix the black screen issue with Unity-based games, maybe this will help:
https://forum.unity.com/threads/black-screen-in-unity-games-games-i-play-not-gam...
https://steamcommunity.com/discussions/forum/1/1480982971174752598/
I believe there is a Bug with Agatha's Figurine.
If you accept the Candied Pair Quest; then the figurine doesn't show up and if you accept Agatha's request first, then it does.
I've also had to play Metal Gear Solid trying to evade Julis looking to force the player to follow them while trying to look for that figurine to figure out where it exactly is, checking the corners of the entire house/place.
I'm afraid simple optimization like RAM cleaning will not work in your case. Looks like your device has enough RAM to play, otherwise the game would just quit itself. The only reason of low FPS I see, not enough power of your chipset (CPU+GPU).
This game does require a high performance phone, mainly because of the fluid simulations in the private scenes. I know it only partially runs on the Samsung Galaxy S10 (with Snapdragon 855), which means even more powerful models are required. I specified the Snapdragon 865 or Samsung Exynos 1080 as a minimum, but the newer is better.
In general, you need to unzip the downloaded game archive to any place you want. Then, locate the game's .x86_64 file and follow these steps:
Now, you are able to run the game's .x86_64 file and play it normally.
I'm afraid, in this case you'll need to search the internet for information regarding your exact Linux distribution on how to run typical Unity games there. Maybe you need some specific commands in the terminal. This game should work normally on several versions of Ubuntu, also some people have reported it working on Manjaro and certain desktop environments that come with Debian distro. In general, it should also work on many other modern Linux distributions.