Well, i played this game for a while, the current 5 stages.
and so far, it's a fairly simple beat them up, the controls scheme is pretty easy.
L/R to cycle through your card deck.
A to use cards
B to jump
Y for light attack
X for heavy attack.
There are some slight variations to the game, but mostly it's just another word for kill them all!!
The only thing that i am not used to is that after defeating a major boss, i do not get any reward or new cards, instead i got my new card from leveling up..
Speaking of Leveling up, you will gained experience after each stage, with bonus exp if you managed to deal alot of damage( getting hit will not penalized you, if it does, there's something wrong with that, you are a lone rider fighting so many baddies, and let's not kid ourselves, just like power rangers, these heroes do not come with fighting many villains 101 , so of cos they will get hit)
So, after you have accumulated enough exp and level up, you will gain a new card or a new ability.