Can i use Synthesizer V Koharu Rikka as ending music for my free fanmade 2D game?

Lounge / 大厅 / ラウンジ
1

I want to ask something about Synthesizer V Koharu Rikka.
I created 2D games, my game is fanmade and free.
I not monetize my game, no add ads into the game.
The game is uploaded to itc.io.
I want my ending music of my game using Synthesizer V Koharu Rikka.
The song is from https://youtu.be/_J4PyIOQXMo?si=M82Zkiyz3YreIbuB.

I already send message to peritune, and the answer is: " You can use the instrumental version without vocals, but if you use a sound source with vocals, please use it according to the terms of the library used (SynthV Rikka Koharu)."

So, can i do it or not??

According to the word “fanmade” and free game, what do you think?? Free fanmade game is commercial or not??

2

The term “商用(commercial)” in Japanese fanzine usual custom means very narrow range.
Free fanmade game is generally regarded as not “商用(commercial)”, as non-commercial in Japan, like fair-use.

3

So i can use the vocal right?

4

Yes. Free game is rightly non-commercial.