I liked it, but it was strange that the first level is the most difficult. In the second and third the enemies take too long to appear, so I can easily kill them (only 4-6 every 20 seconds or so).
I noticed a bug in the second level, where a group of archers got stuck in the buildings on the south-west area, so I couldn't finish the level until I found and killed them.
In the castle I killed the vampire hunter, but nothing happened after that. I went around shooting and scratching the walls in case an enemy was stuck and hidden, but to no avail. Is that a bug or does the game end there?