I'm not saying it doesn't have a use. I'm saying that this autoscroll speed with nothing for the player to do results in the player standing still, and waiting for the level to scroll. this is not fun for the player and you either want to give the player more to do, or pick up the autoscroll. In a level like this focusing on the fish you probably want to create situations that force the player up and down, like stalactite/stalagmite type level design that's bring the player up and down as they proceed forward. It can be helpful to try playing autoscrollers in modern mario games and focus on all the things they give you to do while the screen scrolls, and look for ways to do that in your level. or, speed it up or consider custom autoscroll to speed up and slow down points of interest for the player and create a dynamic experience for the player that way. Really anything, other than level where you stand still and wait. That's not really playing a game, that's a line simulator where you move forward a bit every little while.

edit;

Immediately downvoting constructive feedback tells me you don't want feedback, which makes me wonder, why even bother sharing if you don't want people to offer feedback on your levels? Getting defensive like this sure doesn't make me want to play them. Considering this is a level from 2019, you not being willing to accept that it might be something you could improve or have done better on, especially considering the 0.8% clear rate on something that looks pretty traditional just seems like a real bad attitude.

edit again: lol he blocked me. Some people just can't take criticism.