Great news. A am also for finishing the game as the original is, but then, maybe, there could be an enhanced version in the future, something like Downfall plus, with a lot of new features? If only you would have a time to tweak. Smtg like DJCruicky did with his Alien Fish Finger? Just an idea.
I am curious about new level, I think it is an important step to join two levels together. If this works (including correct score counting, platform style change and possible scrolling acceleration), it should allow the game development to process quickly. I will try to construct a level too. You could use the data from level 0 anyway.