At first I thought this game would be too simple game-play wise but it actually is quite a brain twister for the fact you have to get the energy every 3 seconds while shooting the enemies.
I did have to read from the description I had to grab the blue cubes to gain energy, this wasn't apparent to me from the game itself, probably because it's quite hectic from the start.
All in all I had good fun playing this and managed to get a score of 1680.