Make your comments relevant to a planning process
Look at the guidance available online from the Local Planning Authority.
A full list can be found here
Keep it brief
If you find your comment aligns to the guidance above, keep it succinct and clearly explain which consideration is the basis of your objection.
Tell your Town Council and Local Elected Member
All feedback is relevant, if you find your concerns do not seem to be planning considerations, they will be listened to by your local representatives as part of wider context issues, that can / should be dealt with outside of Planning.