Implemented more enemies and a tier system

core/assets/shaders/default.vertex

@@ -0,0 +1,16 @@
+uniform mat4 u_projTrans;
+
+attribute vec4 a_position;
+attribute vec2 a_texCoord0;
+attribute vec4 a_color;
+
+varying vec4 v_color;
+varying vec2 v_texCoord;
+
+uniform vec2 u_viewportInverse;
+
+void main() {
+    gl_Position = u_projTrans * a_position;
+    v_texCoord = a_texCoord0;
+    v_color = a_color;
+}

core/assets/shaders/outline.fragment

@@ -0,0 +1,35 @@
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
+uniform sampler2D u_texture;
+
+uniform vec4 u_color;
+uniform vec2 u_texsize;
+
+varying vec4 v_color;
+varying vec2 v_texCoord;
+
+void main() {
+
+	vec2 T = v_texCoord.xy;
+
+	vec2 v = vec2(1.0/u_texsize.x, 1.0/u_texsize.y);
+
+	bool any = false;
+
+	float thickness = 1.0;
+	float step = 1.0;
+
+	if(texture2D(u_texture, T).a < 0.1 && 
+		(texture2D(u_texture, T + vec2(0, step) * v).a > 0.1 || texture2D(u_texture, T + vec2(0, -step) * v).a > 0.1 ||
+		texture2D(u_texture, T + vec2(step, 0) * v).a > 0.1 || texture2D(u_texture, T + vec2(-step, 0) * v).a > 0.1))
+		any = true;
+
+	if(any){
+		gl_FragColor = u_color;
+	}else{
+		gl_FragColor = texture2D(u_texture, T);
+	}
+}