Well, I figure out the problem. You have to press C key to pass through the splash screen.
BTW, good game overall. The levels are quite short, so I could understand the cheap traps here and there. The sprite looks really pretty.
Here some suggestions:
+longer levels
+more levels (at least 2 more)
+password system for level select at least
+less cheap traps, more enemies
+numerical life counter, since you can have more than 6
+classic music, I like the songs, but where is classic like 'Vampire Killer', 'Bloodlines' and 'Beginning'? At least one would be great.
+a subtitle in the splash screen saying 'press c to continue', so people like me wont get stuck there cursing your name (just joking)