Fun, but a little buggy?

I enjoy Afterland quite a bit except for one regular annoyance- frequently (at least half a dozen times, so far), when winning the last key to unlock a monster, the game will lock without giving the option to secure the monster. So then, after spending all your energy in battles, you have to exit the game without securing the monster. When you reload the game, it doesnt give you credit for capturing the key. Then you have to wait for your energy to recharge. By then, other players have captured your keys and you have to fight for those keys all over again.
Maybe the game is designed to do so to encourage players to spend cash on in-game purchases to recharge energy, but it seems like a bug. Because of this frustrating issue, I cant give the game more than three stars.

TheOneEco about Afterland - Wonderland Edition