Topic: Could anyone recommend a selection of Indie Titles that I might not have played

That has a bit of everything you know: shmups, beat em ups, platformers, action, strategy games some of the most fun I've had recently has been playing Hollow Knight Silksong on the Switch 2 anything with that level of quality would be a no-brainer for me.

You can't go wrong with Dead Cells. It's an Action/Platformer 2D roguelite. Probably one of the best Indies I've ever played.

You’ve already listed hollow knight so I’m sure you’ll enjoy momodora and any game from the same dev

Absolum
Brilliant rogue-like beat em' up.
Can't recommend it enough. From the makers of streets of rage 4 (which is brilliant too).
If you like mashing and beating everything in sight with lots of replay-ability. Online and local co-op too.
Can't go wrong. Well recommended

In my opinion you can't go wrong with these games :

Cult of the lamb
Death's door
Hades
Lost in random
Tunic