Is it that there were these black(ish) bars going in the middle of the screen? For some reason, this bug occurs on some devices and I have no idea why. Some people get it, some don't. Maybe it's a web only thing but I'm unsure.
Thanks you for playing despite the bugs!
Edit: After a little bit of testing, it seems that the bug only occurs in fullscreen. I've doubled the default size of the window so the game is more playable outside of fullscreen. It would be very appreciated if you were to tell me if you get the same issues while outside of fullscreen.
Viewing post in Rule Breaker jam comments

For me I don't see any black bars.
I'm just saying that I think it's weird that the UI elements are not separated so you get text in between the buttons like this, and it's not a good user experience. Furthermore, you can't see the mouse pointer here, but in this screenshot I'm having my mouse hovered on on of the button selection and sometimes they will be highlighted and selectable, sometimes they don't (like in this screenshot).
Edit: Just saw your edit and I wasn't playing it in fullscreen either.
Yes, you should use a HBoxContainer to line up your different elements when you want to display them horizontally. It prevents these things from happening when you try to display your elements with different screen sizes and resolution etc. Godot has very good UI capabilities, and I have heard experienced users enjoy working with them a lot more than other game engines, but it is a whole can of worms and something to be learned. I'm not that good at it myself yet (as evident in my own entry).
It's ok, it's not the end of the world, and after all the main purpose of these game jams is to learn these things so you become better in the future.
