added objective, added boss

Levels/Objects/Gem.tscn

@@ -0,0 +1,34 @@
+[gd_scene load_steps=4 format=2]
+
+[ext_resource path="res://Sprites/Assets/resources_basic.png" type="Texture" id=1]
+[ext_resource path="res://Levels/Objects/Gem.gd" type="Script" id=2]
+
+[sub_resource type="Animation" id=3]
+resource_name = "rise"
+length = 1.2
+tracks/0/type = "value"
+tracks/0/path = NodePath("GemSprite:position")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/keys = {
+"times": PoolRealArray( 0, 0.3, 0.8, 1.2 ),
+"transitions": PoolRealArray( 1, 1, 1, 1 ),
+"update": 0,
+"values": [ Vector2( 0, 0 ), Vector2( 0, -10 ), Vector2( 0, -18 ), Vector2( 0, -20 ) ]
+}
+
+[node name="Gem" type="Node2D"]
+script = ExtResource( 2 )
+
+[node name="GemSprite" type="Sprite" parent="."]
+position = Vector2( 0, -20 )
+texture = ExtResource( 1 )
+region_enabled = true
+region_rect = Rect2( 2, 50, 20, 20 )
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+anims/rise = SubResource( 3 )
+
+[connection signal="animation_finished" from="AnimationPlayer" to="." method="_on_AnimationPlayer_animation_finished"]