Fun so far I like it. What is the key for grenades? Also I bought the pathfinders boost upgrade for cash since it was my daily deal. Once equipped that just gives me better flight right? Nothing I need to activate?
'F' for grenades. If you're a Pathfinder then the impact nitrons are best reserved for boosting yourself higher and faster.
By "boost upgrade" do you mean the Thrust Pack? If so, then you wait until you have some energy and hit 'C' and you'll get a little kick in the pants.