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the "option" HUD, new music, new text font, achievements in-game and in-kongregate, and just like what tecno said a storyline (like a guy kidnapped my girlfriend and i must save her)... i just wanna add these before i forget them
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i honestly think this game can be one of the top in kongregate, it's simple yet fun, can you put the enemy spawn point on all corners randomly? can you add power-ups (maybe some bomb to clear the stage, a shield when hit disappears, and others), new enemies (green squares are faster than red, yellow can past through anything except blue, even a boss and others), new stuff (like walls, exploives when touched it explodes with a blast radius that kills nearby enemies even you,exploives must have a three second timer, a hole in the floor,and others), and lastly the title (maybe The Invasion, Blockist or something else), above all... GREAT GAME (8.5/10)
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Not really much to this game. =/ Could use a lot more of everything; upgrades, different units, a story maybe, a goal perhaps...