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"PQube strives to release Japanese content for its fans as close to the source material as possible. In the case of Omega Labyrinth Z, while PQube has worked with all relevant age rating bodies in their respective territories, PQube must respectfully comply with the wishes of the platform holder and have therefore withdrawn any future plans for Omega Labyrinth Z’s European and North American release on PS4 and PS Vita."

The game made it past the ESRB with an M for Mature rating, but it seems like Sony asked for censoring before they'd allow it to release on Playstation and PQube refused. 

The ESRB rating for the game:

This is a role-playing game in which players help an adventurer (Aina Akemiya) on a quest to increase her chest size. As players explore labyrinthian dungeons, they use swords to kill enemy creatures (e.g., ghouls, goblins, monkeys) in melee-style combat; characters are depicted slashing enemies to drain their life meter. The game contains sexual material and partial nudity: One interactive mini-game requires players to tap heart icons located on female characters' body parts (e.g., breasts, buttocks, thighs); during these sequences, characters make sexual moaning sounds and are depicted in revealing outfits (e.g. deep cleavage, partially exposed buttocks), provocative poses (e.g., legs spread, buttocks protruding near the screen, characters restrained), and suggestive situations (e.g., a nude woman covered in desert items and frosting)—successful completion of the mini-game results in characters' losing most of their clothing, revealing partially nude bodies obscured by objects/effects (e.g., light, water splashes, rose petals). In another mini-game, players are required to "fondle" a woman's chest to stimulate the growth of a crystal rod found between her breasts. Some gallery images also depict female characters bathing nude, though their breasts and groin area are obscured by steam.