i played the game up until the conversation with the professor, i found the game to be very nice even with the default assets, but something i noticed is that the game looks a bit too fast paced, sometimes i skipped some dialogs because the text speech was too fast. At the end of the conversation with the professor, which was were i left, the game began to fully lag, but for some reason, it was only on the main city, when you exit the game turns back normal.
Thank you for trying the game! Yes, that area of the game does lag for a lot of people: I will work on optimizing that part of the game better. That was one of the earlier bits of content I made, so the events I used to program it could be a lot cleaner. I appreciate the feedback and I hope you'll look out for new updates!