That reminds me a bit of the old "egg" enemies from FF4. Do you have any plans of allowing the player to avoid or manipulate the next round of monsters, or do you just consider it a two-part fight?
Yeah, I guess you could consider it a two part fight, although manipulating it would be an interesting, but I'd have no idea how to execute such a thing. :P
Two-part fight works well, since it gives you the option to keep the mimic while still having a "monster in a box" fight with more monster variety. I was just checking what you were going with here.