Also, you were using the "y" variable to reference the tilemap column and the "x" variable to reference the tilemap row, and then you were drawing the tilemap with draw_quad with the "x" parameter as the column and the "y" parameter of the row! Basically, you confused the variables halfway through, which would cause the data to be drawn sideways. I've done it before lots of times.
I did not confuse them, you've just assumed that the first index variable indicates a row. I know that it's against the convention (of matrix notation) and now I know how those arrays are saved internally, thanks to you, but it doesn't matter, my approach works fine as well. I've done it before.
