You just need to rename your old save file to "What A Mario World! (1.1.6)"
Also yes please tell me if you have suggestions (there isn't a discord server tho)
Thanks for the quick reply! Ok so here're some thoughts, they're basically notes so excuse the disorganization:
1. I felt the difficulty spike at Cheese Gone Bad a bit
2. This was mostly due to quicksand being death pits, which sorta slowed things down (maybe making it escapable would help?)
3. It'd be really fun if the snowballs (in Snow But Evil) can be thrown/picked up instead of just killing you, it could add more depth to the level!
4. Kinda small, but replacing the yellow coins with red in the red ring challenges would be a nice touch! (+ add more of them, they're pretty fun in my opinion)
5. This one might be a bit of a stretch, but the life system seems a tiny bit tacked on (Game Overs don't do much besides sending you out the level). Maybe you could get a powerup at 100 coins instead?
6. Maybe the more gimmicky movements/powerups could use some explaining? (looking at you Cloud Flower...)
7. It'd be nice if you added sections in earlier levels which fully incorporate some custom stuff, just to make sure players know about them (the custom stuff are very cool)
I know I did nothing but nitpick a bit (sorry...), but this hack was amazing. From the sprite work to the music, it was utter peak. Sorry for flooding the comments, wishing you all the best!
EDIT: Not directly hack related, but uploading this hack on different websites might help it get more eyes too. Places like SMW Central and Mario Fan Games Galaxy.