First game that truly blew me away as a Kid i would say Street Fighter 2, there were some games before that amazed and wowed me, and loved so much and still love to this day, like both TMNT2 and Captain Tsubasa Super Striker 2 on NES (which btw is the best soccer game of all time for me, the OST is just too iconic)
But Street Fighter 2 was next level of mindblown, the game simply changed the standards of quality games, the game was so incredible in everyway possible, the characters, the music, the graphics, the gameplay, and all the innovations surrounding it, it was like just too good that you can't believe how good it is and you are just gonna wake up and it was just a dream, but no this masterpiece AF game was real, and would make everything else shit compare to it. I remember one day at school teacher was talking to me and i was so much thinking about Street Fighter 2 i didn't realize she was talking to me (true story), i even remember i was thinking about Vega, his stage and music, and was very fascinate about this character back then, altho my favorite character to play was Ken lol
There are a lot of other games that blew me after of course, and SF2 isn't even my favorite fg of all time. Just to name some of the most incredible and games tht truly blew me AF and changed my life for some, like MGS1 (my favorite game of all time), Tekken 3, Resident Evil, Tomb Raider 2 or Demon Souls, God Of War both 2005 and 2018, and cie.