Really enjoying this tool. It's minimalist and thus does not allow this and that. I think that creates value.
You are being flodded with comments now but I also have a usability concern:
I started using Tape at work (for half a day) and then discovered the DROP THIS IN TAPE.json and accidentally clicked on the text in the top which deleted all entries. At first I didn't even know what happend. After I did it again I was able to read that this would erase all data when clicking on the text...
While every field has an interaction in this app, it wasn't visually clear that something like this would happen.
I think the application should export a json periodically for safety. Or even start with tutorial json loaded.