That was fun! It was challenging at first, but I got the hang of it. The last level ended up being the hardest for me by far.
The GFX look quite nice, and the audio all works very well. The stalking invisible monster is an effective horror enemy, and fits the theme perfectly.
I didn't end up really pushing or pulling items, beyond ramming through them if they were in the way. The traps didn't seem too useful or dangerous, so I ended up ignoring them for the most part.
Also, a small thing, but each level starts saying bullets x1, but I assume that's actually 10, as it then goes to 9. This confused me for a moment.
Great work!