Tested in: FCEUX download (Tested in FCEUX-2.2.6-win64)
Update to this script is posted here
The update.exe files have been removed because of Virus warnings. You can still get them in the relavent link.

View Changes here

• To lunch tab “File > lua >  New Lua Script Window.. > brows to the downloaded file “EmuLua/SpiderDave_Castlevania2.lua”
• Game does save when you visite a church and talk to the priest.
• The start menu has a secret menu when you press select for cheats.

Note: There are a lot of things unfinished, broken or exploitable at the moment 🙁 
The update.exe should had make it easier and has to be remade.  

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