Very nice entry.
The music was sweet though it had a weirdly long amount of silence in the end. Sound effects were nice also but a bit scarce, could have used of those squishy and splashy sounds when jumping/walking etc.
Liked the sprite work and animations. The stair climbing animation was kinda weird (hovering in the air) but everything else was spot on. I was kinda surprised the first time I encountered a person and tried to interact with them. The blood splatter permanence between lives was a nice touch.
Just after I reached the final level and was thinking about mentioning it being too easy, I started dying and ended up actually getting a game over. Immediately went for another run and easily beat it by playing a bit more carefully and actually planned my kill orders. So quite nice difficulty curve.
Then a list of nitpicky quality of life fixes that would in my opinion make it better:
- Arrow keys as alternative
- Separate jump button (for the other hand), jumping with up is awkward for some people (me included).
- Not having to jump in front of elevators for the doors to open.
- Allowing the traversal of the small vertical gap between floor/platforms without jumping.
One other small issue (but not that easily fixed) was double jumping up the platforms. They were positioned so that the timing was very strict unless you noticed that if you reach close enough, it resets your jumps and you can actually do a quad jump.
Overall, good job!