I believe that something must be done about crashes due to levels lacking the appropriate start positions. A memory increase wouldn't hurt either, seeing as some levels still crash due to apparently too many baddies and/or animations. However, seeing the progress that's already been made, I'm sure you've already thought of these things.

An additional feature I'm sure many would like included is the ability to trigger a music change (or more) during the level, but seeing this quote:
"Also, there has been discussion about the boss music thing you mentioned. However, it will be made more or less obsolete by a new feature Violet has coming." by Jerry it seems that this is already in the works.