The very talented guys at Square Circle Co., Chris "iopred" Rhodes and Chris "DayDream" Hildebrand, have just released their third Heli Attack game, and it's available exclusively at Miniclip.
Heli Attack 3 is an arcade survival shooter that keeps much the same as the previous one. And that's not a bad thing since Heli Attack 2 was Miniclip's best game of 2003. Instead of changing the core gameplay, the team added movements such as climbing and crouching, and a whole slew of new weapons. Level progression was also added for a change of scenery and to increase enemy difficulty. And a really cool gun was added to reward those hardcore gamers who make it through the impossibly long final level.
Web browser games don't get much better than this, and these guys prove that you really can develop serious games in Flash.