We're always open to suggestions.

We're in talks about some more perks to help address the balance of the Whales and the 'Hiders'. We agree there needs to be some more ways to interact with each other.

Attacks held don’t consume shards from the attacked player, and I think that’s a bug in my view. Those attacks should also consume shields. And all items should increase price too the more you use them per round.

Not sure I fully grasp this point; we are looking to increase perk prices with use. Not sure what items you are referring to?
And attacks should kill defenders even on a defeat; if we haven't implemented that yet, I will chase up the dev. It should have been done by now.

Not sure what you mean about the shield.