Foreword: Heaven's Cage is a very curious find for me due to its fresh, uncommon view on MMORPG. It pleasantly surprised me on more than one occasion. Here are the results of this experience.
VNDB: https://vndb.org/v1355
Youtube: https://www.youtube.com/watch?v=m4rkHG8K-TE&list=PLs4Gp5VU4Fv_nMwz1VgZtn0zheAWpoWfO
Youtube: https://www.youtube.com/watch?v=m4rkHG8K-TE&list=PLs4Gp5VU4Fv_nMwz1VgZtn0zheAWpoWfO