I used haruna and it works. The instructions on the FreeTube GitHub could be clearer though. Depending on if you’re using FreeTube and or the external player as flatpak there are different ways to get it working.

Check out the workaround with an external player. It worked for me during the time friend didn’t work the past few days.

One of them isn’t

Since roguelike is also derived from the game rogue, is simply suggest something like survivor-like. Your suggestion has the problem: not all are 2D, not all have distinguishable waves, and not all are auto shooters :D