Sorry for the delayed reply.
Thank you for the wonderful feedback.
Since many of you shared the same impression, I realized that the percentage of people who don't enjoy it seems to be higher than those who do.
I don't much care for overly explanatory games, so I tried to make it playable without much language. But as is often the case, things don't always turn out as planned!
For now, I've made the game page more user-friendly.