Played Snap 2 over the weekend. Put about 8 hours in total and I'm probably 60% of the way through the game I would guess. You could easily yolo the story in probably 3-4 hours if that's all you cared about, but the game is extremely enjoyable to rerun tracks as like
@Local Coyote said above they level up as you get more Pokemon pictures.
Every Pokemon has 4 levels of picture, related to what they are doing, everything from standing around to special interactions (Think Slowpoke and Shellder causing Slowbro Evolution in OG Snap).
Images get a ranking of Bronze, Silver, Gold, or Diamond. Tracks level up as you get different star pictures or higher ratings for each Pokemon on that track, and every track has a minimum of 2 versions like Day/Night. Every track also has alternate routes you can find that will give you different angles or see different Pokemon.
If you want a nice relaxing game with a ton of replayability it's worth getting.
Edit:
There's also picture requests the main NPC cast will give you that reward you things like titles, frames, and stickers for editing pictures with and they give hints about unlocking some of the behaviors required to get higher star pictures. For example there's a request to get a picture of an Alomomola blowing a bubble ring, and so you have to go find out where and how to get that picture opportunity.
To expand a bit more on tracks leveling up. Not only do Pokemon behaviors and placements change, but new Pokemon will begin to show up, and sometimes the alternate routes only become available above a certain track level, or after triggering certain events. (Like launching Porygon onto the button on the swamp level in OG Snap). You can also choose which level you would like to play a track at, as some picture opportunities are only available at certain track levels.
There's a surprising amount of depth to the game if you are going for 100% completion.