Games to play for inspiration

I have been on and off trying to GameDev for the past year or so but I have never allocated the time... But that's about to change

I am willing to re-start. Got the programming part sorted out, and already doing simple Pixel Art stuff. However, I am struggling with simple game ideation. I am reading some books, blogs, and writing very simple GDDs.

However, something I feel I am lacking is variety in the games I play. I feel I have some interesting ideas but I am lacking reference to expand those or come up with new ones

What games would you suggest to play to simply expand my horizon? Any games that you really like that have interesting or cool mechanics? What are the "Must play" games that you consider I should play to develop a better game-design-oriented mind?