Cool game! I really enjoyed the graphics, I went for a similar minimalist / silhouette style with mine. You absolutely nailed the atmosphere in this game, even the little effects like the parallax on some of the levels was really cool.
Two small issues I encountered was the big monster (level 2/3) crawled right through me and didn't kill me. Then in the level after that the text on the screen was super small, I have a large monitor, so make sure to have screen scaling on any text boxes you may have.
Overall, fun game and good entry. Please check out mine if you get a chance!