Protect Circle (Created In Few Hours)

Move the enemies moving towards the circle with the "arrow keys". Over time the number of enemies will increase and circle will grow. 

You can also fill the energy at special points and use the ability with "space" button.

Controls;

"Arrow Keys" to move.

"Space" to use ultimate ability. (Energy bar needs to be full to do that)

"M" button to mute / unmute

"R" to restart game.

This game was just a challenge with myself.  Enjoy :)

(Full screen is recommended.)