Create a Flash game like Cirplosion

Mouse.hide();
// the rate you circle grows when you keep mouse button pressed
// the higher the value, the fastest the growth
grow_rate = 2;
// number of enemies on stage
enemies = 15;
// enemy speed...
enemy_speed = 3;
// this is the speed to add to enemy's speed when he comes close to an explosion...
speed_add = 3;
// ... how close? addspeed_range determines it.
addspeed_range = 50;
// enemy creation
for (x=1; x<=enemies; x++) {
	enemy = _root.attachMovie("enemy", "enemy_"+_x, _root.getNextHighestDepth(), {_x:Math.random()*450+25, _y:Math.random()*450+25});
	// angle of movement... 6.28318531 = 2*Math.PI (just faster)
	enemy.angle = Math.random()*6.28318531;
	// the enemy starts with no additional speed
	enemy.addspeed = 0;
	enemy.onEnterFrame = function() {
		// updating enemy position
		this._x += (enemy_speed+this.addspeed)*Math.cos(this.angle);
		this._y += (enemy_speed+this.addspeed)*Math.sin(this.angle);
		// checking if the enemy left the stage in order to make them appear on the other side
		if (this._x>500) {
			this._x -= 500;
		}
		if (this._y>500) {
			this._y -= 500;
		}
		if (this._x<0) {
			this._x += 500;
		}
		if (this._y<0) {
			this._y += 500;
		}
		// calculating the distance between the enemy and the player   
		x_dist = this._x-player._x;
		y_dist = this._y-player._y;
		distance = x_dist*x_dist+y_dist*y_dist;
		// if the enemy is touching the player...
		if (distance<(this._width/2+player._width/2)*(this._width/2+player._width/2)) {
			// if the player is growing then reset the player
			// later he will lose a life
			if (can_grow) {
				reset_player();
			}
			// if the player is exploding, then remove the enemy   
			if (explode) {
				this.removeMovieClip();
			}
		}
		else {// if the enemy is not touching the player but it's close enough to receive speed from the explosion...
			if (distance<(this._width/2+player._width/2+addspeed_range)*(this._width/2+player._width/2+addspeed_range) and explode) {
				// inverting enemy direction
				// later it will be adjusted according to angle between the player and the enemy
				this.angle -= 3.14159265;
				// adding extra speed
				this.addspeed = speed_add;
			}
		}
	};
}
// attaching the player on stage
_root.attachMovie("player","player",_root.getNextHighestDepth());
_root.onEnterFrame = function() {
	// updating player position
	player._x = _xmouse;
	player._y = _ymouse;
	// if the player is growing...
	if (can_grow) {
		// scale up the player
		player._width += grow_rate;
		player._height += grow_rate;
		// if the player touches the edges of the scene then reset it
		if (player._x-player._width/2<0) {
			reset_player();
		}
		if (player._x+player._width/2>500) {
			reset_player();
		}
		if (player._y-player._width/2<0) {
			reset_player();
		}
		if (player._y+player._width/2>500) {
			reset_player();
		}
	}
	// if the player explodes, then reset it 
	if (explode) {
		reset_player();
	}
};
// when the player presses the mouse...
_root.onMouseDown = function() {
	// if the player has not grown, then make it grow
	if (!has_grown) {
		can_grow = true;
	}
	else {// if the player has already grown, make it explode
		explode = true;
	}
};
// when the player releases the mouse...
_root.onMouseUp = function() {
	// if he was growing...
	if (can_grow) {
		// the player has grown, now it's ready to explode
		has_grown = true;
		can_grow = false;
		player._alpha = 50;
	}
};
// simple function to reset player stats
function reset_player() {
	player._alpha = 100;
	player._width = 10;
	player._height = 10;
	explode = false;
	has_grown = false;
	can_grow = false;
}