link, in case Steam is acting up: https://www.youtube.com/watch?v=AzjwGl2N5No

You can find out which level you are on by going into Settings and choosing Select Level.

These times have also been added as a comment on the video itself.

Level 1: 0:04
Level 2: 0:14
Level 3: 0:21
Level 4: 0:28
Level 5: 0:36
Level 6: 0:49
Level 7: 0:58
Level 8: 1:06
Level 9: 1:20
Level 10: 1:34
Level 11: 1:45
Level 12: 2:00
Level 13: 2:23
Level 14: 2:40
Level 15: 2:51
Level 16: 3:06
Level 17: 3:19
Level 18: 3:33
Level 19: 3:46
Level 20: 4:03
Level 21: 4:26
Level 22: 4:47
Level 23: 4:59
Level 24: 5:09
Level 25: 5:32
Level 26: 5:52
Level 27: 6:12
Level 28: 6:32
Level 29: 7:08
Level 30: 7:32
Level 31: 7:50
Level 32: 8:08
Level 33: 8:21
Level 34: 8:40
Level 35: 8:55
Level 36: 9:21
Level 37: 9:32
Level 38: 9:44
Level 39: 10:09
Level 40: 10:20
Level 41: 10:30
Level 42: 10:40
Level 43: 11:15
Level 44: 11:38
Level 45: 12:20
Level 46: 12:41
Level 47: 13:22
Level 48: 13:45
Level 49: 14:41
Level 50: 15:17
Level 51: 15:43
Level 52: 16:06
Level 53: 16:21
Level 54: 16:52
Level 55: 17:30
Level 56: 18:11
Level 57: 18:39
Level 58: 19:13
Level 59: 19:41
Level 60: 20:13
Credits: 20:33