Thanks for answering!
I use a laptop, AMD A9, 3.1GHz, 8 GB RAM (Only 6 are useful) Windows 10. Maybe game settings are the problem here, I don't know how to downgrade them, the Unity run settings doesn't appear to me. A in-game menu for this would be great if you ask me.
I played the game (updated) before my answering, but still with low Framerate (aprox. the same).
P. D.: The game still not appearing in Itch for Windows. I got the same problem with my last project, and I fixed it by marking the game as executable after fully uploaded.