Unity Build&RunをするとGetKeyDownが反応しません

前提・実現したいこと

c#でspaceキーを押すと3Dモデルの髪の色が変わるものを作りたいと思っています。
乱数で髪の色を変えているので、その乱数をcsvファイルに出力しています。

発生している問題・エラーメッセージ

下記のコードでは、プレイモードでは動くのですが、Build&Runをするとキーが反応してくれません。
csvファイルの方もBuild&RunではStart()の分しか出力されていません。
プレイモードの方ではキーの回数に合わせて出力もできています。
何か解決方法を教えて頂けないでしょうか

該当のソースコード

C#
1using System.Collections;
2using System.Collections.Generic;
3using UnityEngine;
4using System.IO;
5using System;
6
7public class haircolor2 : MonoBehaviour {
8
9
10    public Texture hair001;
11    public Texture hair002;
12    public Texture hair003;
13    public Texture hair004;
14    public Texture hair005;
15    public Texture hair006;
16    public Texture hair007;
17    public Texture hair008;
18    public Texture hair009;
19    public Texture hair010;
20    public Texture hair011;
21    public Texture hair012;
22    public Texture hair013;
23    public Texture hair014;
24    public Texture hair015;
25    public Texture hair016;
26    public int count;
27	// Use this for initialization
28	void Start () {
29        Renderer render = GetComponent<Renderer>();
30        count = 1;
31        int h = UnityEngine.Random.Range(1, 17);
32        hair2Save(h);
33        switch (h)
34        {
35            case 1:
36                render.material.mainTexture = hair001;
37                break;
38            case 2:
39                render.material.mainTexture = hair002;
40                break;
41            case 3:
42                render.material.mainTexture = hair003;
43                break;
44            case 4:
45                render.material.mainTexture = hair004;
46                break;
47            case 5:
48                render.material.mainTexture = hair005;
49                break;
50            case 6:
51                render.material.mainTexture = hair006;
52                break;
53            case 7:
54                render.material.mainTexture = hair007;
55                break;
56            case 8:
57                render.material.mainTexture = hair008;
58                break;
59            case 9:
60                render.material.mainTexture = hair009;
61                break;
62            case 10:
63                render.material.mainTexture = hair010;
64                break;
65            case 11:
66                render.material.mainTexture = hair011;
67                break;
68            case 12:
69                render.material.mainTexture = hair012;
70                break;
71            case 13:
72                render.material.mainTexture = hair013;
73                break;
74            case 14:
75                render.material.mainTexture = hair014;
76                break;
77            case 15:
78                render.material.mainTexture = hair015;
79                break;
80            case 16:
81                render.material.mainTexture = hair016;
82                break;
83            default:
84                render.material.mainTexture = hair001;
85                break;
86        }
87		
88	}
89	
90	void Update () {
91		  Renderer render = GetComponent<Renderer>();
92
93          if (Input.GetKeyDown(KeyCode.Space))
94        {
95            count++;
96            int h = UnityEngine.Random.Range(1, 17);
97            hair2Save(h);
98
99            switch (h)
100            {
101                case 1:
102                    render.material.mainTexture = hair001;
103                    break;
104                case 2:
105                    render.material.mainTexture = hair002;
106                    break;
107                case 3:
108                    render.material.mainTexture = hair003;
109                    break;
110                case 4:
111                    render.material.mainTexture = hair004;
112                    break;
113                case 5:
114                    render.material.mainTexture = hair005;
115                    break;
116                case 6:
117                    render.material.mainTexture = hair006;
118                    break;
119                case 7:
120                    render.material.mainTexture = hair007;
121                    break;
122                case 8:
123                    render.material.mainTexture = hair008;
124                    break;
125                case 9:
126                    render.material.mainTexture = hair009;
127                    break;
128                case 10:
129                    render.material.mainTexture = hair010;
130                    break;
131                case 11:
132                    render.material.mainTexture = hair011;
133                    break;
134                case 12:
135                    render.material.mainTexture = hair012;
136                    break;
137                case 13:
138                    render.material.mainTexture = hair013;
139                    break;
140                case 14:
141                    render.material.mainTexture = hair014;
142                    break;
143                case 15:
144                    render.material.mainTexture = hair015;
145                    break;
146                case 16:
147                    render.material.mainTexture = hair016;
148                    break;
149                default:
150                    render.material.mainTexture = hair001;
151                    break;
152            }
153        }
154	}
155    public void hair2Save(int h)
156    {
157        StreamWriter sw;
158        FileInfo fi;
159        fi = new FileInfo(Application.dataPath + "/logL/hair.csv");
160        sw = fi.AppendText();
161        sw.Write(count + ",");
162        sw.WriteLine(h);
163        sw.Flush();
164        sw.Close();
165    }
166}
167