Snipe: Pump rifle, Flashy glasses, Iron rifle.
Timerift: Higgs grenade, Retro spaceship, HC-bomb
Protoblaster: Skull bracelet, Lucky cat air freshener, Receding ponytail
Raelynn: Power pills turbo, Med i'-can, Solar tree
First buy the Solar tree and the Flashy glasses. Try to grab as much solar as you can. When you have enough solar max out your other snipe abilities. Assuming you fire immediately when your snipe is ready and you don't miss a single shot you'll be able to get about 90 solar per minute. At this point you can buy Power pills and Med i'-cans.
If you are losing at this point buy the timerift andthe Retro spaceship to slow the other team. After that, buy the Higgs grenade and the HC-bomb
If you are winning at this point buy the protoblaster and upgrade everything, the order doesn't matter.
Play Style and Tips
Focus on enemy awesomenauts and enemy droids. Make the way clear so your teammates can push and destroy turrets.
Try to get as much solar as you can, damage upgrades aren't cheap.
Don't die, if you have to wait 15 seconds to respawn you'll miss +/- 25 potential solar.