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Some of the stars - especially the bottom right - look not too bad.
There will be others who know more about this than I do - but some ideas are:
1. I think that the most likely cause of this is that you camera is not sqaure to the image plane. If you are using an MPCC, these can be tricky to seat squarely in the focuser.
2. If it was flexure, I think all of your stars would be similar shapes
3. coma is elongated stars that all have their long axis pointing towards the middle of the image.
4. It may also be some field rotation if your polar alignment was off.
Hope that helps
Adam
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