This is a Touhou fangame. 
It's a 2D exploration danmaku action game (AKA a danmaku Metroidvania). 
 
You'll control Hata no Kokoro on a journey to find her masks. 
Rather than clearing individual stages, you'll explore and find various items to power up along the way. 
Four difficulties are provided, so you can have a good time if you're not skilled at danmaku action games.

Complete info of Kokoro's Gensokyo Journey: The Lost Masks, release date, trailer, gameplay, critic and gamer review scores.

Kokoro's Gensokyo Journey: The Lost Masks gamer reviews

More