Thank you for your feedback, exactly what I am looking for, someone to tell me what's wrong! When it comes to the dialogue, I realized that once I started playtesting some of the games in the jam. Not having both things open was a part of the gameplay, as at first I had them opened both at the same time but that felt just too easy, I wanted to challenge the player's brain. Not being able to Ctrl C/V was for the same reason, but you got a strong point about feeling more like the grandma, that would've been actually a better one, but the storyline is that you can't Ctrl C/V due to the notepad being corrupted (it says DoNotDelete.exe when you open the notepad :)).
The UI is really my weakest point in Game Development as I am specialized in programming and wanted to show off more the programming skills but still learn and improve the UI/UX. The leaderboard is my fault, it was initially okay but I had to fix some last-minute bugs and I guess I broke it while doing that. Thanks for sharing also the keyboard issue, never really knew that German keyboards have different commas/dots.
I am also a bit confused whether you liked the game or not :) Many people say it was frustrating but at least a few for sure found it entertaining even though frustrating, is that the same with you? I admit I created the game a bit more towards my taste, which is a bit different than the usual gamer, so I am trying to learn how gamers think. Again, thanks for the feedback and I am glad you managed to beat the game!