Played this game when I was really young. It was a side-scroller, almost flash game, you had a view of a battlefield where enemies were marching towards a tower. You had to defend this tower against them. Your original weapon was some sort of gun or sniper, but as you killed enough enemies you could temporarily level up your weapon. The enemies ranged from foot soldiers to tanks to airplanes that dropped more soldiers. Been looking for this game for ages now and I can't find it because every time I utter the word Modern Warfare the results on google fill up with Call of Duty. Please help me.