The exact number of megaways is always displayed above your reels, on every spin. Lightning Strike is played on a six-reel board in which each reel can randomly have between two and five symbols inclusive, and depending on the setup you get, the game can have up to 15,625 ways to win.
I've played it for a few hours and wasn't able to make a profit as I didn't land some mega win, but I still think this is a quality game. Everyone will like the theme and the bonus features, but players won't like how rarely does this game pay.
This game looks a lot like Thunderstruck II in theme, and it's one of the best megaways games ever released as it uses megaways that pay both ways.