Consider evolving the shape of the castle structure, more changes throughout levels. design could be improved perhaps as it grows it could expand to the left and right resembling more of a castle rather than resembling a archer tower or single colem
Please increase
castle troops for smaller clans and lower level castles.
The ability to do limited selection of preset praise or taunt comment to a previous attacker.
Choose a clan member you want to attack from the leagues especially if you know them personally but in a seperate clan and would like to play them a single 1 on 1 time other than at random.
Ability to change clan name once like you were able to change your username at least one time.
Re: in game economy
Consider & keep the awareness that many people aren't financially able to purchase large amounts of gems in make it so you can still advance without constantly breaking your bankroll.
Perhaps promotional reward times during the week where you get double experience or double gold or periodically for logging in and playing during certain times,accomplishing certain achievements,perhaps random resource awards, like for example five free walls or a lower level trap Like many other games offer.
Basically A incentive/bonus for loyalty and performance
Extend small 2o min protection "too short" for unsuccessful rates are hundred percent on your village .
It Takes currently 20 minutes to send 1 troop request let alone restock castle troops for fair troop defense especially in smaller clans.
Possibly a two-week shield purchase option or larger for higher levels with longer upgrade times
Possibly additional workers for higher levels requiring longer work times
Increased amounts of gold mines and pumps and production rates for these at higher levels specially after Townhalls 11+ that require a longer upgrade times.
Ability to expand field tiles slightly at higher levels and resources increase.
Minions need to be upgraded ,way to week at every stage.
(personal opinion)
More walls, bombs & springboards amounts.
More
Achievements
More opportunity for the less skilled-
Perhaps adding a tips section.
Add smaller search for clans and members
Worldwide
Ex: west coast
East Coast
Canada
Mexico
Europe
Asia
Etc. etc.
These are at the top of my list
Thank you for your time and patience