Whoa! What a ton of work you put into this (and in RPG Maker?!). Picked this one out of the top 20 entries on a lark and was happy I did. The pixel movement, platforming, unique mechanics (love the projectile whipping) is really, really impressive. I found the writing and cutscenes to really hit the mark as well. Great entry. I really thought the second boss would be it, and that probably would have been a great game in itself, but it kept going and going!
For a jam like this with a controlled length, I think you really could have focused your phenomenal effort on maybe half the game that you made? I think it would have been just about perfect if you had gotten some story arc to complete by boss 2, or maybe cut a few rooms so reaching boss 3 was a lot faster, and then focused on some awesome artistic scenes to wrap up the experience. It hurts me to have to quit before completing everything, but I think its easy to get fatigued with the challenging gameplay. Regardless of that, amazing job and good luck!