Card Delete is definitely an option we consider in the future. Because it tends to be really powerful to make your deck thinner in a deckbuilder, we want to add it in the right context.
Card Fragment Switch was one way to make your starting cards evolve without having too much impact.
We will try to add some content to the game, but our main focus at the moment is Day of the Shell, our upcoming Tactical Roguelike. We are really happy that you liked the game and are looking forward to develop it further when we can.