That sounds like an amazing experience haha. I have some fond memories like that with these games too.
I think in my case, the narrative isn't the main thing I enjoy about metroidvanias - rewarding exploration is what I really love. Though I didn't play a true metroidvania until I was into my teens, some of my favorite games before that were exploration-focused platformers and (simple) RPGs.
I probably would have been frustrated and given up with my favorite metroidvanias if I had played any too young, but 8-12ish would have hit that nostalgia + enjoyment sweet spot. But hey, even without any early nostalgia I can still love them :)
ngl I actually really like that. the start button popping out over the taskbar is a nice touch. what's the setup?