- Exclamation blocks (death blocks) palette change a few times during the game. I would recommend to keep only one color for it (maybe red) so it doesnt get confused with other harmless exclamation blocks, or maybe changing it to actual death blocks gfx.
- Hot Pocket Temple:
This fireball jump (2nd on the gif)seems almost unfair. You could remove layer priority from the lava to make it visible. Also, you can swim on the ceiling lava.
- Seaside observatory:
I would recommend you to avoid putting turn blocks on the top of the level. Its an easy spot for cheese. It happens some weird stuff to the ow palette if cheesed this way, but it will back to normal.
- Woji castle:
in this room theres an annoying blind jump. To avoid it you could change the scroll setting on marios head to "no vertical scroll"