it might be useful to be able to actually click items accurately if it's going to be a mechanic for the last boss. I lost a gem because clicking a bomb wouldn't work under the pile of other items.
Not only is the energy system a terrible idea for a game that makes you grind, but if the connection drops on your server, you lose the energy you spent to go to the level. That's horrible. Why would I spend money on something like this? It's so blatant as to be completely off-putting.
The air units come in from the opposite side, but they still spawn randomly on that side. When air drops can come in and their drop spot is right in front of them, they are impossible to defend against. It is really frustrating.