The first thing about Super Mario Bros: Odyssey that will jump out at you is that the game has a well-developed story that you will have to follow. You can select Mario or Luigi, but either way you will have to face the game's different levels, keeping in mind the fact that your main goal is to bring the Mushroom Kingdom back to life.
Once you start to run and jump, you will also notice that there are a few new changes to the game's traditional mechanics. You will see some special giant coins in the scenes that will be very difficult to reach. If you are able to collect all of them, you will unlock special screens.
In addition to this, Mario (and Luigi) are now able to 'wall jump.' That is to say, you can push off the walls in order to make multiple jumps, though you will have to practice a lot in order to do so well.
Super Mario Bros: Odyssey is an excellent Super Mario fan game. It not only improves the gameplay of the classic Nintendo games, but it also does so while offering good graphics and a great soundtrack.