Played the tech demo and I have to say, it was pretty great but a little bland. Well, but then again it was just a tech demo :-p
so anyway, bugs:
--> Sometimes the enemy sort of go invisible when they are "crossing" you and you attack them.
--> The skeleton monsters sort of jump from an edge of a raised platform to the middle of the bottom platform.
--> If you use the windows close button to close the game, it generates a blank error file called jet_err_**** (* is four digit number)
PS: So glad that I downloaded the game before you took it offline :-)