What's wrong with the design?

Each app needs to show the name of the app. I use vs code every day and didn't recognize that logo off the top of my head. I had to click back and forth on each logo for the ones I don't use. I get the gist though, if you're quickly looking for shortcuts presumably you know what the logo looks like.

I agree with this. I was hovering on a button and then checking the link string in the lower left of the browser to figure out which icon was what.

IFTTT is a nice example of a button/icon heavy design that also includes simple text descriptions.

Also, personally I would like to see vim on there.

I don’t exactly agree with the initial comment, but an accessibility audit would find a few blunders (like mint green text on a white background, which is very difficult to read)

It would be easier to say what's good about it.

A lot easier.