I'm sorry to hear that you are having problems with the game.
It could be an issue with the UI elements being misplaced due to an incompatible screen resolution. Just yesterday, I was testing a Mac version with someone and he was experiencing UI issues because his monitor didn't support 16:9 resolutions. The game is created and designed to work with 16:9 resolutions, so that might be the issue.
When exactly did it happen?
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, you can see where the UI appears to navigate through the hallway on the right. If your game doesn't look like it does for this guy, the resolution might be the problem. Try switching to full screen or windowed mode.
By the way, Our Red String is awesome, I'm a huge fan of Eva Kiss' work and it inspired me a lot to create this game. I didn't know the other game in your signature, I've seen it and it looks really good. I'll take a look at it.