Yes you can upgrade every power by collection enough shards, which are easy to find throughout the map.

That's sweet! I was worried that you'd have to sort of pick a main power to use. I even think I read that as a negative in a review somewhere...

It is what makes this game super fun. You absorb whatever is near you, all powers are effective. imagine that your smoke power is running low while fighting,  you see neon lights close to you and absorb them, the pace of the battle keep changing with your power. "Really fun" is the best way to describe this game.

I just finished my evil playthrough and all I can say is this game is the most awesome game I've played

I'm halfway through my 2nd play through now, expert evil. Regie Rowe was clearly not written for the evil path. He complained maybe once while I was gunning down his cop buddies. The game play is great, not having to worry about hitting civilians makes expert easier than normal with good karma. I only wish the game would let you skip the cut scenes on a second play through.

The game was designed to do heavy data loading during the cut-scenes that's why there is no option to skip them. Small price to pay for having no loading screens.