it works

engine/actor.go

@@ -19,6 +19,7 @@ type Collider interface {
 }
 
 type Actor struct {
+	ID
 	Position image.Point
 	Size     image.Point
 

engine/solid.go

@@ -10,6 +10,7 @@ func init() {
 }
 
 type SolidRect struct {
+	ID
 	Rect image.Rectangle
 }
 

main.go

@@ -64,12 +64,17 @@ func main() {
 				&engine.GobDumper{
 					KeyCombo: []ebiten.Key{ebiten.KeyControl, ebiten.KeyD},
 				},
+				&engine.Scene{
+					ID: "level_1",
+					Components: []interface{}{
 						&engine.Tilemap{
 							ID:       "terrain",
 							Map:      tiles,
 							Src:      engine.ImageRef{Path: "assets/boxes.png"},
 							TileSize: 16,
 						},
+					},
+				},
 				engine.PerfDisplay{},
 			},
 		},