Great game with amazing exploration, and fun albeit sometimes confusing gameplay.
The enemies were not overly difficult but I found some of them super annoying after a while and it made backtracking such a hassle. The Metroid in the endgame were awful as well as the space pirates and the Metroid Prime took me about 30 minutes to beat with no deaths. Once I finished collecting every chozo artifact, I was already over the whole game.
Not much else to say. I had fun.