The song is very simple, therefore I would keep dash usage consistent throughout the whole map. Right now it doesn't seem to follow anything in particular, which makes the map a bit more interesting, but it doesn't work because it doesn't represent the song properly.
To make it more consistent I would group the notes in 3 or 6 notes and between each group you can put dashes. That's the simplest solution.
If you wanna put a little more effort, you could overemphasize stuff everytime you put 00:00:118 (1,2) - this kind of double, so you could have double dashes there (into the double and after the double)
you could overemphasize stuff everytime you put 00:00:118 (1,2) - this kind of double, so you could have double dashes there (into the double and after the double)
added some dashes to doubles