This movie is a prime example of how to take a decent idea, and completely destroy it with poor production decisions. From the very first character interaction, you’re left with an extremely rushed and underdeveloped feeling. This feeling only intensifies throughout the rest of the story.
The animation quality is all over the place, and not in any sort of artistic way.
The attempts at building suspense all missed the mark, and none of the characters have any depth. The “heroine” of the story is the only character with any value, and even she has nothing redeemable going for her.
The minimal attempt at science and the biology of the island are oversimplified and add nothing to the story.
I assume the nonexistent ending was intended to be a cliffhanger, but it failed.
Even the fan service aspects have zero effect on the story and don’t even make sense.
Honestly, the only good thing about this movie is how bad it is.