and dare i say Zero Mission a few years prior I have to say I really enjoy the metroidvania game play, and though I am not expecting such from this game I felt it would be a good idea to come here to ask what other games in the two series are worth playing as well.
Is it because they are fun, or because they help you forget who you are? -King of all Cosmos on gaming
Here's some list of games you should try for both series:
For Castlevania, try Aria of Sorrow first. Dawn of Sorrow is a follow-up for it, so it's more wise to play them that way. Of course, you can buy Castlevania Double Pack for GBA, which includes Aria of Sorrow and other GBA Castlevania, Harmony of Dissonance. And then, of course there are Portrait of Ruin and Order of Ecclesia for DS. Order of Shadows is also downloadable for cell phone in the US. If you have a Wii, you can access the Virtual Console, and try some olc-school Castlevania's there. Simon's Quest has exploration elements as the other two are starightforward action titles. There's also Castlevania Judgment for Wii, if you're interested in Beat 'em up. It also gives some backstories of Castlevania Characters.
As for Metroid, you have played chronologically the first in the series, so I'd advise to play them in that order. Here is the chronological order:
Metroid: Zero Mission (GBA) Metroid Prime (NGC) Metroid Prime 2: Echoes (NGC) Metroid Prime: Hunters (NDS) Metroid Prime 3: Corruption (Wii) Metroid 2: Return of Samus (GB) Super Metroid (SNES, VC) Metroid: Other M (Wii, working title) Metroid Fusion (GBA)
The Metroid Prime Trilogy is also soon available for Wii. Hope that helped.
If .you have a Wii, try Super Castlevania IV (on the Wii virtual console). IMO it's the best of the pre-SotN castlevanias--and I think it's better than any of the post-SotN castlevanias too. But that could just be me.
Revenge is a dish best served with some fava beans and a nice chianti. Wait a minute, that's not right...
If you have a PSP, pick up Castlevania: Dracula X Chronicles. Not only is it a remake of what could be considered the best Classicvania, but it also has Symphony of the Night and Rondo of Blood as unlockables.
When there are no doubts left -- Things become clear. Peace and quiet are only for the bore[d]...