My first released game is hard to play now because Flash is dead, but it was a falling block puzzle game with blocks and bubbles called "Oh, Buoy!" in 2007 or 2008 :)
My first game I EVER built I cannot show, but it was written in QBASIC around age 9, and I believe the text display looked something like:
"Please Guess A Number Between 1 and 50: "
And then you'd type something like "27" and the game would say:
"Your Number is Too High. Guess again:"
And then you'd guess like "13" and it would tell you it's too low, until you get the right answer and it would output:
"21 is the correct answer! It took you 4 guesses!"
Sick game right? :)