Hey, thanks for letting us know (and for giving our game a shot)! We reduced the embedded game size to hopefully be out of the way of the itch overlaid buttons. Apparently there's threads for itch to fix these user buttons overlapping with games (such as this thread), but doesn't look like there's been any site-wide changes to fix things yet.
If this size reduction still isn't enough, it looks like clicking the fullscreen button in the bottom right of the embedded game should be another option.
Again, thank you for the feedback!