Make the letters collectable like coins. I did this on my own hack (Banzai Mario world) but it's obviously inspired by countless other games that do that. Idk if you were already gonna do that but it makes it more interesting or making the letters block that's you can hit, but I think coins would be interesting too.
I think it'd be cool if you could collect the letters like coins as well, as was suggested long ago, but I think it'd be better if instead of having the letters vanish after collecting them, they should just be empty and grey instead of coloured or whatever. (That way, we can actually still read them after we collect them as coins.) Or they could be coinblockish, like in some other games. (Sonic Colors comes to mind)
inb4 erik says "hitler was late to conversations too" again
Just another idea- we should make the credits music be a compilation of like a volcano theme/desert theme/jungle theme/ice theme, like Sonic 1, wherein it plays short segments from each Zones' song and mixes them together.
Updated the list. I'm pretty sure only one name is missing, the ripper of the BG in Veck's level. I would appreciate it if you told me.
Also, I think it's decided to make a credits roll with collectable letters as coins. So be it, I'll try make them unless someone wants to give it a shot.