fix: apply code review

lib/game/bloc/start_game_bloc.dart

@@ -21,10 +21,10 @@ class StartGameBloc extends Bloc<StartGameEvent, StartGameState> {
 
   final PinballGame _game;
 
-  Future<void> _onSelectCharacter(
+  void _onSelectCharacter(
     SelectCharacter event,
-    Emitter emit,
-  ) async {
+    Emitter<StartGameState> emit,
+  ) {
     _game.gameFlowController.start();
 
     emit(
@@ -34,10 +34,10 @@ class StartGameBloc extends Bloc<StartGameEvent, StartGameState> {
     );
   }
 
-  Future<void> _onHowToPlay(
+  void _onHowToPlay(
     HowToPlay event,
-    Emitter emit,
-  ) async {
+    Emitter<StartGameState> emit,
+  ) {
     emit(
       state.copyWith(
         status: StartGameStatus.howToPlay,
@@ -45,10 +45,10 @@ class StartGameBloc extends Bloc<StartGameEvent, StartGameState> {
     );
   }
 
-  Future<void> _onPlay(
+  void _onPlay(
     Play event,
-    Emitter emit,
-  ) async {
+    Emitter<StartGameState> emit,
+  ) {
     emit(
       state.copyWith(
         status: StartGameStatus.play,

lib/game/bloc/start_game_event.dart

@@ -6,16 +6,37 @@ part of 'start_game_bloc.dart';
 abstract class StartGameEvent extends Equatable {
   /// {@macro start_game_event}
   const StartGameEvent();
+}
+
+/// {@template select_character}
+/// Select character event.
+/// {@endtemplate}
+class SelectCharacter extends StartGameEvent {
+  /// {@macro select_character}
+  const SelectCharacter();
 
   @override
   List<Object> get props => [];
 }
 
-/// Select character event.
-class SelectCharacter extends StartGameEvent {}
-
+/// {@template how_to_play}
 /// How to play event.
-class HowToPlay extends StartGameEvent {}
+/// {@endtemplate}
+class HowToPlay extends StartGameEvent {
+  /// {@macro how_to_play}
+  const HowToPlay();
+
+  @override
+  List<Object> get props => [];
+}
 
+/// {@template play}
 /// Play event.
-class Play extends StartGameEvent {}
+/// {@endtemplate}
+class Play extends StartGameEvent {
+  /// {@macro play}
+  const Play();
+
+  @override
+  List<Object> get props => [];
+}

lib/game/bloc/start_game_state.dart

@@ -40,7 +40,5 @@ class StartGameState extends Equatable {
   }
 
   @override
-  List<Object> get props => [
-        status,
-      ];
+  List<Object> get props => [status];
 }