Firstly I did reach out to the designer first but never got a reply so I think it is only fair that I share my tips.
I would expect such an easy pattern not to have mistakes and imperfections in it.
1. The stitches don’t add up (R4 produces 96 stitches (since at the very end you make a puff cluster but can only skip one stitch instead of two before making the last dc).
2. The sleeve says to make 38 rows but when you count the rows on the cover photo or the photo where the parts are shown, it’s not the same and got me confused. In the end I made 35 rows for size small.
3. When you put together the sides, it would look much nicer if there weren’t two puffs directly next to each other so a little more work to make it align would give a nicer finish.
4. When making the ribbing on the neck there are the shoulder parts that aren’t straight dc, so I would like there to be instructions on how many dc I should make on top of these stitches.
In the end I did get a nice sweater but the process was not smooth.