Shield: makes you immune to damage, Ballista: adds a bow that can destroy obstacles, Repairer: restores your life points over time, Reloader: decreases your cannon reloading time
I think i found what each upgrade does
Cannon: reduces time to reload the cannon, Armor: increases your life points, Ram: reduces the damage you take, Wheels: makes you jump higher
You know you can just ask the people in the chat if you didn't understand anything from the tutorial instead of giving this game a bad rating and comment about the bad parts of it
SKsith maybe if you played more till the tutorial finishes you would have found your new favorite game also people that didn't play this before don't mind the comments up there they posted when this game was made its much better now