game: add bullet and impacts

game/bullet.tscn

@@ -0,0 +1,20 @@
+[gd_scene load_steps=3 format=3 uid="uid://c603t5do5rnqk"]
+
+[ext_resource type="Script" uid="uid://j5k8dvghgsf4" path="res://bullet.gd" id="1_v8qja"]
+[ext_resource type="PackedScene" uid="uid://bg1q0xweaefoq" path="res://models/bullet.glb" id="2_t4vbm"]
+
+[node name="Bullet" type="Node3D"]
+script = ExtResource("1_v8qja")
+
+[node name="bullet" parent="." instance=ExtResource("2_t4vbm")]
+
+[node name="RayCast3D" type="RayCast3D" parent="bullet"]
+transform = Transform3D(1, 0, 0, 0, -4.37114e-08, -1, 0, 1, -4.37114e-08, 0, 0, 0)
+target_position = Vector3(0, -0.2, 0)
+
+[node name="Timer" type="Timer" parent="bullet"]
+wait_time = 10.0
+one_shot = true
+autostart = true
+
+[connection signal="timeout" from="bullet/Timer" to="." method="_on_timer_timeout"]