I,m only going to say a few upgrades here just because of how many upgrades there are so lets get started.
first upgrade is the amount of click points per click thats the green gem looking upgrade
second upgrade is the the clicks per second thats the one that hase the three gears in it
third is the gems all they do is spawn on the map and if you blast them with your nerf bullets you colect them.
fourth the health boost this just gives you more max or heals you up 50 persent health. (it will only heal you if you get dameged.)
and finally the big heart this is different from the fourth one because this one spawns on the map
and it fully heals you