Alu Song was mostly written in the autumn of 2017. This song for the bells should be played freely as to tempo and dynamics, at the players own discretion. Indeed, there are no dynamic markings in the score.
Make sure, though, that the music has a certain flow and be aware to keep it going throughout.
As the piece is essentially contrapuntal, try to color the lines by means of touch and different hardness of mallets.