This latest version includes multiple updates such as the below:

• Gamepad controls: Fixed the right stick. You can now play using a gamepad
• Touch screen controls: Fixed the right stick. You can now play on mobile devices
  
• Added a delay on the upgrade panel pop ups, this stops you from accidentally selecting an upgrade
• Fixed sound effects and lowered shoot volume as it was a bit annoying
• Added and switched the text input to the Unity Legacy input field in order to get an on-screen keyboard pop up when playing on a mobile device. You are now able to use the on-screen keyboard to enter your name on the main menu if on a mobile device

Click here to play the latest version of the game.