GREAT!
This game is great. The graphics are awesome, reminds me of Zelda: Link to the Past (First level reminds me of the woods..) All of you who say the controls are too hard, you just suck.
Easy way to beat level four: Upgrades(Top to bottom) 3,3,3,2 (Least thats what I did it with every time, if you suck try all 3's or all 4's) Use the javelins, attack the left turret a few times (5-6), run (fly) to right corner, attack left turret again from there. You should have control of the left turret by now, now get the right one, which should be really eazy, from there its a piece of cake. Oh and make sure you keep the towers, heal them by attacking them.
Keep it up, I cant wait for the full game.