This ROM hack focuses on the Kiddy Kingdom area within the original Banjo-Kazooie, presenting modified gameplay within that specific level. "Kurkoin Quest" likely refers to a specific objective or quest introduced within this modified Kiddy Kingdom, suggesting a focused alteration on the gameplay within that part of the game.  The version number (v0.5) indicates this is a work in progress.

Banjo-Kazooie - Kurkoin Quest v0.5 - Kiddy Kingdom

Banjo to Kazooie no Daibouken 2 (Japan)