Use WASD to move and Arrow keys to shoot and space to press ok. Esc will also open pause the game while in a game. You can also press shift to hide the hud. You can upgrade your gun twice, diying will remove your current upgrade and prevent you from picking it again. Most upgraded weapons are shot using space.

The color of gun seems to repersent a theme. Orange is pierce, Green is dash, Blue is homing, Red is multishot, and Yellow is radial.

There are 5 different teir 1 guns. All t1 upgrades are shot with space except red and blue. The game will pause when you are selecting an upgrade.

Red is just multi shot and the only T1 gun that fires like the starting gun.

Yellow is a radial burst.

Green is a suicidal dash were you charge at the enemys with a sho[/previewimg]rt moment of invinvcebility.

Orange is a single peircing shot.

Blue is what apearts to be a cloud that you move around using the arrow keys raming it into thing.

Each gun has a different second upgradeds. This part will get filled out as more upgrades are discovered.

Red upgrades

• Red, More multi shot/Arrow Keys
  
• Orange, Volly of preicing shots/Space
  
• Yellow, single shot that continulessly explodes into more shot upon impact/space
  
• Green, Shots a single orb with particles/Space
  
• Blue, Homing shots/Arrow keys

Yellow upgrades

• Red
  
• Orange
  
• Yellow
  
• Green
  
• Blue, Permanent ring of plasma that damages enemies and auto spawn homing shots/None

I have not tried all the so they will have to be added later. Please rate up if you found it helpful. Also Reds T2 Blue upgrade seems to be the best so far.