The original soundtrack on Youtube

As of 2024-07-14, the original soundtrack is on Youtube: 

There are as many as 29 different tunes or parts:

00:00 Intro
04:31 Menu
07:02 Slot Select
09:02 Mountain Road 1
10:58 Mountain Road 2
13:19 Shoreline 1
15:26 Shoreline 2 (premium edition)
17:40 Castle
20:20 Cave
23:14 Outside Castle
26:14 Abaddon’s Castle
31:25 Mushroom
32:07 Bonus Room
32:59 Level Cleared
33:10 World Boss
34:55 World Cleared
35:41 Final Boss
37:06 Ending
41:22 Extra Life
41:26 Chest
41:34 Game Over
41:46 Bonusroom (initial version)
42:38 Bonusroom (unused)
44:21 Evergreen (thematic try-out)
46:24 Mountain Road (unused)
48:20 Mushroom (initial version)
50:25 Intro (thematic try-out)
52:29 Abaddon’s Theme (orchestral sketch)
52:57 Evergreen Theme (orchestral sketch)