I kinda couldn't wait, hyped myself up too much after hearing that :en joined the crew. I actually noticed a couple patterns from Phantasmagoria Trues in there. I think the issue may be with him joining though. It felt very PT-ish in the later stages to be honest. The music was great, but yeah, it didn't feel as..powerful at the music from MPP Stages 4-6.
I really do hope that the extra stage will make up for it, maybe revise the game a bit more in the update, make it feel less like a Len game, and more like an Ido game. As said earlier in the thread, Ruri will probably be the extra stage midboss, being a Shikigami and all. The 5th stage boss's theme sounded okay. I wish there was a final phase like what Mitama Magahara did, with a music change and all.