In 2014, he obtained an advanced degree (Master of Fine Arts) in filmmaking from the Chung-Ang University in South Korea as a Korean Government Scholarship Holder (KGSP).

Subsequently, Flying Fish world premiered at the IFFR and was nominated for the Festival's Tiger Award.

The film reflects the deep social and psychological trauma of Sri Lanka's twenty-six-year-long civil war.

In a review for the 5th Cinema Digital Seoul Film Festival, film commentator Tony Rayns wrote that, in Pushpakumara, "Sri Lankan Cinema has found its true modernist" and he has also described Flying Fish as "scrupulously non-partisan, deeply humane, sexually candid, coolly modernist in style and almost indecently beautiful".

In 2019, the Amma project was also invited to Film Independent's Global Media Makers LA Residency in Los Angeles for advance script development.