I think your world has a great mood, and aesthetic. I get the whole over ambition thing, did that a bit my self. The player movement feels sort of clunky, but it is a gamejam so I get it.
It wasn't super clear to me at first, that the statues give -1 nothingness, and killing the creatures give +1. Part of that is there was no visual or audio feedback, so when I would look up at the text at different times it would read differently, and I wasn't sure why. Maybe renaming it to "Lost souls", or something like that would have made it a bit more clear what was happening with out much extra work.
The other thing is that once I got up in to the cloud section, it was harder to tell where to go. Over all, it is pretty good. I like the idea of having to be careful not to kill too many creatures, and if you do then you need to find another one of the statues. Cool game overall! Good job.