You could add different game modes that depend on the level that is currently loaded. For example a race mode with more and less dangerous tracks. Even though it looks like sh*t, I've spend a lot of time on the following sketch:
(Imagine a wider path)
I've made the same post in your forum (yeah, free updates/ upgrades!). Should I/ we still post here?
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual