Ninja Princess

From MobyGames:
'You play as a female ninja as you fight your way through hordes of enemies on your quest to recapture territories and to take back the Castle all of which have been captured and occupied by the enemy forces. Throwing knives and shuriken are your weapons as you shoot your way through enemy occupied territory.'

Getting the five purple scrolls are a must to access the true final level and ending, and not only that, you also need to trigger a secret passageway at Stage 10 which is shown in this video. Otherwise the game loops itself after Stage 12.

00:00 - Start
00:15 - Stage 1
00:59 - Stage 2
02:18 - Stage 3
03:49 - Stage 4
04:18 - Stage 5
05:23 - Stage 6
07:03 - Stage 7
08:04 - Stage 8
09:25 - Stage 9
10:15 - Stage 10
11:34 - Stage 11
12:17 - Stage 12
12:03 - Stage 10 (alternate exit)
13:57 - Stage 13
15:03 - Ending