Greetings! I made a new soundtrack for a map this time, Ninja Island!
Here it is!
If you are wondering how I created it, I made it with GarageBand for iPadOS, and the drum and watermark were added with the macOS version of GarageBand.
What do you think can improve with it?
If you want to see what the map looks like with the music, here you go!
I have seen this game before… Looks like it can turn into an amazing creation! I recommend changing the sky to a cartoony sunny sky as it might brighten the map up and make it feel more exciting 
Yeah your music is really good. Its kinda uniform compared to mariocart tracks but its like 75% the way there
doesnt fit with a kart game zzzvxbxb
It certainly doesn’t sound bad and uses instruments like the Koto which is often used in traditional Japanese music, but I feel it could be slightly faster. This is a racing game, so I think the tracks should be fast enough to accompany how fast you’re going.
It looks really good, but it seems weird for a car game with a Japanese theme.
I recommend a kind of cartoony or minigame kind of style game. My opinion though!