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My first game was "Renegade" (a saboteur behind enemy lines); it weighed only 250 kilobytes back then. The graphics were terrible (compared to today's standards). But the gameplay was amazing (I'd love to see a similar game today, but with great graphics). I played it when I was only (almost) 6 years old (it was 1985). Yes, everything was so basic, and that's when I developed my addiction to computers.
The gameplay is as follows (maybe someone can suggest something similar):
There are several missions (maps) in the form of rectangles. Your task is to complete these missions. At the beginning, you equip your character and select ammunition (depending on the mission, you collect different items). Then, your plane flies over the area, and your task is to drop 3 sets of ammunition and then jump out yourself. Then everything is simple: you run to the target (killing everyone), collecting bags of ammunition along the way. You complete the mission, wait for the helicopter, and fly away. It's a crazy game, especially for a child who is almost 6 years old.