Interesting idea, but for me an app switcher needs to be super fast and switch between the apps I want without interrupting my thought process.

I've used an auto hotkey script for years that has served me perfectly. I press my shortcut modifier (the right Alt key) and then the letter of the app I want to switch to. For example, Right Alt + C will switch to my code editor VS Code. Right Alt + T will switch to MS Teams.

Repeating key presses will switch through all instances of that app so Right Alt + C, C, C will switch to the third open VS Code window.

The top row can be temporarily assigned to any open window for using on windows I have open that I'm switching to frequently but only while I have work in progress.

The scripts are at https://github.com/dattiimo/ahk-scripts for anyone interested.