Thank you for the feedback!
Concerning the Level Three solution, the method you used was not the intended solution (I didn't realize it was possible, very clever indeed!), so in the future, I will consider changing the layout a bit at the end to avoid any unnecessary red herrings.
I do plan on potentially expanding the game in the future. The water idea is very good, I actually considered it previously myself too. Though, I will only start being able to make big changes to the game after the GDC Fall Game Jam ends due to its rules.