Trillion: God of Destruction For vita is only 18.36 USD on amazon so only AUD 32.78 delivered to australia. Cheaper if you can use one of the amazon pickup points which apparently exist here (which I didn't know).
From wikipedia "The game contained several key staff from the Disgaea series of Japanese tactical role-playing video games. The game is directed by Masahiro Yamamoto, who previously directed Disgaea 4.[5] The game's music was composed by Tenpei Sato, who had previously composed music for Disgaea: Hour of Darkness and Phantom Brave.[22] Character art was designed by Kei Nanameda, who had previously done designs in Compile Hearts' Mugen Souls.[5]"
Famitsu gave the Japanese release a review score of 34/40.[24] Within the first week of release in Japan, the game sold 18,506 physical retail copies, placing fifth within the weekly software sales charts.
Ratings aren't great for the English release possibly because it was marketed more as a rogue like when it's more of a VN with some Rouge and other game types thrown in. Anyway take a look at other reviews to make sure it's your kind of game first.
Still pretty cheap for a physical version (no aus version) especially when it came out so recently.
Great price for retail but the digital is around $11-$12 on PSN right now I think.