add Interceptor

src/score/score.controller.ts

-import { Controller, Post, UsePipes, Body, Param, Get } from '@nestjs/common';
+import {
+  Controller,
+  Post,
+  UsePipes,
+  Body,
+  Param,
+  Get,
+  UseInterceptors,
+  ClassSerializerInterceptor,
+} from '@nestjs/common';
 
 import { ValidationPipe } from '../shared/validation.pipe';
 import { ScoreService } from './score.service';
@@ -29,6 +38,7 @@ export class ScoreController {
 
   // shows scores, :id is gameId
   @Get('get-score/:id')
+  @UseInterceptors(ClassSerializerInterceptor)
   @GameStates('STARTED')
   async getScores(@Param('id') gameId: GameEntity) {
     return this.scoreService.getScores(gameId);