Memory leaks! - The game starts to lag for me after about 3 runs. Press F5 or refresh to fix this. It is caused by coding issues which causes the game to buffer the same assets over and over.
Upgrades = Fun. You rush the battles to just get the upgrades. Fastest way to upgrade = money; thus money = fun. What happens once you have everything? Get Bored and quit; or buy new content. :-)
I like the GUI, but this game was done better 10 years ago on Myspace when it was an original idea. Also mixing the energy and Stamina resources into "Crew" hurts the definition of play style in this game. This is a clone and it is pay to win as stated previously.