Beautiful, lovely game! So well balanced, it constantly gives you more and more stuff to do and sets small goals you can choose and follow. Splendid.

Edit: I mentioned some performance issues but it was my fault as it was running on my integrated GPU instead of the dedicated one.

Here’s my FTUX playthrough:

Hey there, thank you so much for playing! Do you mind if I ask what specs your computer has like ram/graphics? And did you try turning on fast graphics in the options menu? You're the first person I've found that has problems on fast graphics. Thanks!

Hi, tried it on both my stationary and my laptop and the game seemed to run fine for me, even late game with a tonne of stuff running.

it runs fine on my laptop.

Wow! I have played Vivaria before, and now I can play the sequel! 🐱
The unlock system boosts motivation to play, which feels really great!
The map is larger, so creating various environments is possible, and that is a nice touch. It is super fun!
And just like others, I notice that the game slows down a little in the later part. It feels about 1/2 to 2/3 of the normal speed. Even when changing the rendering setting to "Fast" in pretty mode, the speed does not change. The GPU usage stays around 10%, whether on the lightweight title screen or the slowed-down game screen.
Only the CPU usage increases from 2% to 15%, but it is not fully utilized. 
For reference, here are my PC specs:

🐱 Windows 11
 CPU: AMD Ryzen 7 5700X
 Memory: 32GB RAM
 GPU: NVIDIA GeForce RTX 4060

 And this is my streaming recording!

An update from me: it actually runs fine. Once it goes on Steam the problem should be gone. It was not an installed app since you download an exe. It was not recognized as a game and for some reason it run on my integrated GPU. Once I forced the usage of my dedicated GPU it was running fine. I wonder if we as developers have any control over influencing system’s initial decision whether to use dedicated or integrated GPU.