I notice there's no full screen button on the lower right of your game, and the game window is also set to be very small. Ironically the game starts out with a bunch of text in the beginning and it's hard to read at the small size. Perhaps this text should be placed on the itch.io page itself in case it's important in any way.
The game itself seems to be fine though even in the small size.
Another thing you could do is on itch.io page where you edit your project, you may be able to tick the box for "Fullscreen button" and then save the change, and this wouldn't count as changing your actual game as long as you don't change the upload itself. This edit would be similar to adding content on the itch.io page itself, which everyone can do even on jams with locked submissions, and there's no specific rule against editing the itch.io page contents or settings for this jam as long as you don't change the game file itself.
Overall, the controls feel very clean and the mechanic is simple but fun, nice job on this game!