This happened to me in a few other games I tried to play! It's probably a bug in the itch.io website. Try to refresh the page a few times? Maybe fullscreen will work better in this case. I'm trying to figure out why this happens as well :(
I felt like the game was very simple and not challenging. even though it was super enjoyable, i feel like it had no goal and had more potential to be something better. But then again, it is a game jam and it was only 3 days so don't take this harshly. Just if you were to make another game with a larger time limit or none at all, I would recomend putting a bit more time into making the game more challenging and more eventful and less repetitive.
Oh, don't worry! I completely agree with you. I was just wondering what I could do specifically. I thought about adding more obstacles, definitely other environments such as other rooms or forests would make the game more interesting, but this is a really simple game so I have no idea how to make it challenging other than speeding it up. Anyway, thank you for the heads up!