On a history basis, I really appreciate this game a lot. It is the clear starting foundation for the excellent 2D platformer series we know today as
Super Mario [スーパーマリオ] and it also helped renew interest in console video games and consequently revive the industry itself after
Atari ended up doing the opposite. The controls are quite good as far as NES platformers go, the level design is, for the most part, pretty intuitive, and the difficulty progression is well integrated, with each world being quite a bit more difficult than the last. I want to highlight World 1-1 in particular because it is such an excellent tutorial level in teaching you aspects about the game. World 1-2, World 2-1, World 4-2, and World 6-3 were also pretty interesting design wise and the level design in general helps keep a lot of things pretty fresh.
However, I do think this game has a handful of negatives, a lot of it being derived from its status as a starting foundation. It has not aged that well compared to nearly every other
Super Mario [スーパーマリオ] game. I think it's particularly clear in the design of some of the bad and underwhelming levels in the game. Levels like World 3-2 are basically "here is a straight line of enemies with extremely minimal jumping" and the castle levels that require a certain combination of movements to solve the puzzle, by which you are given almost zero immediate indication that you did it successfully or not, are not very fun to play through either. I think World 8-3 is my least favorite level of the game since it expects you to deal with a barrage of Hammer Bros, a pretty annoying enemy in general but I think it's particularly egregious here because it's very difficult to get past them without taking damage or dying, unless you know the speedrun strategies or happen to keep a fire flower on you but most players that play the game will not do either of these things.
Overall, it is definitely worth trying out but it has a handful of poorly aged design decisions that prevent it from being a good
Super Mario [スーパーマリオ] game. Still though, it's an important foundation that gets fully realized and expanded upon in later titles and is one of the most important games of all time in general.