My very first video game? Shit, my memory sucks, I'd need to just list off several candidates for that. In my early childhood, I had a lot of NES games (SMB was one of course), I also had a lot of SNES games, so I played A LOT of TMNT 4, Super Mario World, Mario Kart 64.. I also was one of those kids that played Pokemon Red and some Wario Land game in the car while we went on trips, trying to use street lights to see in front of me.
So maybe that? Green Gameboy color with some ancient games.