The introduction sequence was great and hooked me immediately. The soundtrack created a powerful air of suspense. Very well done!
I see two major problems with your game: 1. You have to wait in front of the door that is the end of the level, and literally nothing happens after you found the door. It's kind of a waste of time, so make sure that your player has to wait for nothing (except for idle games, but i also saw no numbers going up). 2. The enemies were super weak and posed hardly any threat.
My conclusion: writing good, art gorgeous, sound nice - but gameplay boring.
Disclaimer: I played only the first two levels because I was bored after that. Apologies in case I missed some significant gameplay that would have changed my rating T_T.