I liked Metroid Dread a lot. I feel like it’s a good starting point for Metroidvanias too because the game does a good job nudging you in the right direction e.g. by closing off certain areas but still letting you explore and figure out where to go. I especially enjoyed the movement, it feels very fluid and satisfying.
The only major issue I had with the game was that performance is really bad in a few encounters. Most of the time it runs fine though. It’s also not super long. I prefer a game that doesn’t overstay its welcome, but if you’re looking for something that is good value for money in terms of playtime there might be better options.
You’re thinking of Dota Underlords, which was popular for a short time but then quickly got abandoned. I definitely wouldn’t count it as a success.