Low replay value aside this is an enjoyable romp, granted you have the patience and skills to finish these treacherous castles.
Amazing Princess Sarah is a competent, if uninspired indie platformer.
At the end of the day, Amazing Princess Sarah does a better job of emulating the Castlevania formula than a lot of bigger publishers in the past when they've tried to. The combat could really use more variety - things do get a bit repetitive from that standpoint, but the level system and well-designed levels do provide additional hooks to keep the player interested.
Amazing Princess Sarah is a good retro platformer, of that there is no doubt. There's also plenty to do, although the nature of the implementation means that some will feel that it crosses the line into repetitiveness. It would have taken longer in development of course, but if the game had 30 levels in play as opposed to five levels repeated six times with slightly different character parameters, the developers would have been onto a surefire winner. As it stands though, Amazing Princess Sarah still has the ability to hook you and is enjoyable enough for the price.