It's not immediately understandable how you should play, but after trial and error I kind of got the hang of it. what I understood was that you can only get points when making horizontal lines and if there are vertical lines next to them, they disappear too, and you get more points. There is a number on the left that increases, and you cannot fully drop blocks with a number equal or lower than said number, to make them fully fall you have to drop more blocks onto of them. There's like a gray area that goes up, but I didn't understand what made it go up nor what it was for, I think it was for stopping the block from falling. I got a message saying that I lost, but I was not sure why I lost because I barely have blocks below, and I thought I was doing well. For the record, I played 4 times and my record was 690, I think.
Maybe some music can make it more intuitive, because certain song effects are used to indicated that you did something right nor wrong. I liked the game tho, I will play more in the future.