Thanks for saying so — you were right, and it was a fair thing to flag.
There is a full preview: https://youtu.be/d8m2vIJGtkE — it runs all 12 tracks, about fifteen seconds each. It went up the same day this page did, so it may well not have been there when you looked. And even once it was, the page never actually said anywhere that you could listen to it. That was the real problem, and I have fixed it across every pack now.
If you would rather hear how the loops behave in an engine than in a video, the free sampler is three complete tracks under the same licence, no cost: https://wafusoundworks.itch.io/wafu-free-sampler-japanese-game-music