Super Metroid - the atmosphere in the beginning of the game was something else when I started it the first time. The rain, the music... As a kid I was just mesmerized.
Gradius - being too fast is not always the best.
Factorio - planning goes a long way. Even if you think you planned for enough space for your construction it will never be enough as you probably need to make it larger later on.
A week... My family took 4 week vacations every summer. Of course I had to buy a game the first week. Those manuals and gaming magazines during summer got a lot of attention.
Sweet memories.