The songs he composed for the first Mr. Driller were deemed unfitting for a puzzle game by some of the staff and they almost didn't make it into the final product.

[2] Shiina's first solo project was Mr. Driller G. He was given extensive access to live instruments and an incredible amount of creative freedom, setting the stage for his later work.

His soundtracks contain a wide range of musical styles, including jazz,[5] orchestral, fusion, and rock, and he often mixes different genres and instruments together for unique sounds.

Many of Shiina's songs use live string sections, slap bass, audio filter effects and artificial languages.

The genre doesn't matter..." Shiina feels that there are two types of compositions: "some tracks can stand alone as musical pieces, and some only work when you hear them in the game," and he often alters or leaves out certain songs when putting together albums.

[6] On 14 May 2021, asteroid 119846 Goshiina, discovered by American astronomer Roy A. Tucker at the Goodricke-Pigott in 2002, was named in his honor by the Working Group for Small Bodies Nomenclature.