Gameplay wise it's pretty much perfect. Samus controls like a dream, she's super smooth, fast and fun. The areas are really well designed, bosses are really great, the puzzles (mainly the speed booster ones) are amazing. There is also A LOT of intended sequence breaking and it blows my mind. The lore addintions this game has are pretty cool in my opinion. The replayability is throught the roof and the game encourages speedrunning. Emmi sections are cool at first but they start to get repetetive later.
Sadly the areas mostly look very same-ish and the music is extremely unremarkable and that's a same.
Still a game really worth playing if you are into Metroid or Metroidvanias as a whole, but I do reccomend playing Zero Mission, AM2R (or Samus Returs), Super and Fusion before it.