We’ve seen loads of games with a NES-like presentation, but not many with an Atari 2600-inspired design.
Love is one such example: an extremely minimalist platformer-exploration title with few colors and blocky graphics. The shtick is that players have 100 lives and may place an unlimited number of checkpoints on any surface. This means that the game is fairly easy to beat, but you’re encouraged to use as few lives and checkpoints as possible. There is also a “YOLO” mode where players are literally granted one life, as well as a speedrun mode. It’s very endearing for its sheer simplicity and deconstructionist approach.
Fall in love with it by popping in on its Steam page.