I tried it and it looks really nice but like most of these it has too many small editing thorns for me to use. Two I noticed right away

- ctrl-a works to go to start of line but for some reason ctrl-e doesn't work to go to end

- ``` doesn't start a code block, you have to use 'insert code block'

Good job on paste image from clipboard though which is another feature that I think is completely essential for something like this and weirdly missing in many of them.