Well that was special. I enjoyed this more than I should I think.
Graphics are obviously bad, but I like them. They remind me of the time when I used to download plenty of freeware games about 15 years ago. Here are some things I think you should focus on.
- Audio. Graphics do the job for now I think, but you should definitely put a lot of work into audio. Footstep sounds for you and enemies, random ambient noises, hit sounds,... Plenty to add.
- I also think you should focus heavily on the exploration aspect. As much as possible. Openable fridges, cupboards, wardrobes or boxes. Put more items in hard to reach places, the usual things games like deus ex or system shock 2 does.
- It seems you have some kind of stealth system in place. Would be nice to have some early game means of using it, like throwing items to distract enemies, setting up sound traps with clocks or fire crackers or maybe even some kind of motion scanner to see where moving enemies are.
As I said at the start, I really liked this and I hope you keep working on it.