I have been playing Tears of the Kingdom, but when my wife has been playing I have been switching in between Serious Sam 4 and the original Commander Keen.
Commander Keen takes a little to get used to the game feel and style, but I am actually enjoying it pretty well. You can feel a lot of what would go into id shooters. Mazelike levels with a series of key cards, but on a 2d platformer instead of a fps.