So most classes are locked at the initial start of the game. No problem there. We all like a little mystery. But then we're forced to upgrade the classes we do pick at the end of every round. In order to repick upgrades, you have to pay. Maybe an option to skip the whole upgrade phase would be beneficial?
Seems to be a glitch with the save files. If you start a game with mouse controls and then make a new game with keyboard controls, the first save file will also require keyboard controls. Only way to fix issue is make another new game and switch back to mouse. Otherwise, great game. I enjoyed it.
Using Energy to limit gameplay in hopes that people will actually spend money to play more is a fruitless endeavor. You are alienating more players then you'd ever hope to gain with that train of thought. The game is not horrible and you probably put a lot of thought into card interactions but then you only let us play for a certain amount of time. Instead of an enjoyable game, you have a grindfest that only benefits the players who have played the longest. Any new player faces an uphill battle against everyone else with better cards and more time to have gained those cards. For those reasons (which I credit to poor game mechanics and planning), the game gets a 2/5.