I've spent the last 3 or 4 days (they're all blending together at this point) animating, coding and tweaking the boss for the end of Chapter 1. It's easily the most complex thing I've coded and I'm really happy with the results.
This chapter is 90% complete and I'll soon be looking to get some feedback from beta testers. I'm looking for 2 or 3 people who would be willing to play through the game thoroughly and provide me with impressions, flaws, bugs, suggestions, etc.