Compared to normal sheet music, this system mostly deletes cues. In normal sheet music, you have both the shape of the note and its rough position horizontally on the page as cues about the rhythm. Measure lines are removed in this system, which is a pure loss of readability, like removing periods and commas from English and replacing them with extra spaces (while saying you are trying to aid beginners, who may be still learning what a sentence is!). In normal sheet music, a note is either on a pitch line, or between two lines, where as in this new notation, a note may be on the left half or the right half of a space between two lines. It's just visually more difficult to parse.

The octaves are seemingly delimited by solid black lines, but these lines actually represent the note C#, counterintuitively. My feedback there is that you've been staring at this too long if you think it immediately resembles a piano keyboard. Make it look more like a piano keyboard if you want it to be more readable than sheet music for beginners.

Make the example of your notation match the example of traditional notation. There should be three notes in the right hand at the beginning of Let It Be.