Hey, this was great! I love the idea of a perma-berserk party member. Paper Mario 64 has an unused badge that makes Mario berserk and increases his attack, and playing a randomizer that adds it back in is a lot of fun. UFO 50's RPG, Grimstone, also has a functionally Berserk party member in the form of a dog.
As others have said, the type triangle is a fun spin on the usual formula. I will say, in my personal run through, Formless was the clear winner, simply because 90% of the post-floor 1 fights were all evildewers. I only ran into a solid enemy a single time in the form of the golems, which beat me up enough that I wound up resetting anyway. It is possible to get some pretty rotten luck if you run into the three evildewer troop and they all decide to bubble Mr. Solid. I greatly appreciated the save points, which balanced out the high encounter rate. I actually managed to get through the entire tower without using my items, which was good, because they were pretty essential in the final fight.