Please add more content to the game, sometimes it's really bad to play and do the same things all the time, it would be interesting to be able to combine the elements, or more options of cards per game, the game is pretty cool, but sometimes it makes become cloying because there are few possibilities. They could take advantage of the Yu-Gi-Oh! where a certain type of card benefits, the game could be less automatic and more strategic.
The developers do have big plans for the game. There is a land expansion coming which will give a world to play in. There are books and comics coming as well. They have mentioned the possibility of a player vs environment mode to give it a different feel also.
There are plans to add essentially a new phase of battle with spells or something similar down the road. Also the plots, they will produce new content once that update rolls out. Not to mention a new pack is literally being released in less than a week. So hold tight, and master your craft. It won't be long!