This is an rpg/platformer hybrid like the Castlevania games on the DS. The controls are explained in the "Help" section on the main menu and also by the soldier in the starting area.
If you're cursed, you can't attack with your weapon, so use a holy ward, cast anti-curse, or find a Zenu statue as soon as possible. You can break baskets and flower pots for items that restore HP or MP or give you money.
The game is automatically saved every time you enter a new area (when you touch an arrow post or go through a door).
Right-click game to play full-screen (if available)
Up Arrow - Jump
Down Arrow - Talk, go through doors or windows, etc.
Left and Right Arrows - This should be obvious
X - Attack
C - Hold down to charge magic, then release when bar at bottom left is flashing to cast
Z - Go to next dialog page when talking to someone
F - Use carbonated fruit punch (Restore HP)
G - Use green tea (Restore MP)
H - Use holy ward (Remove curse)
Space - Open status window
Esc - Close status window
1 thru 6 - Change selected magic spell (Can change any time)
Q thru U - Change equipped weapon (Only in status window)