The newer demo feels pretty good as far as control goes. Good job there. It started to feel a little like Super Metroid (and Metroid Prime, for that matter!) again. 
Since the physics are nearly complete, does that mean the hardest and longest part of creating the game is almost finished? Is the rest of the game as simple as placing a platform here so you can get the powerup there according to the physics?
Hmm… Here’s a question that gets more information. In a percent, how much time out of the total time it took to create this game did the creation of the physics take?