That's an interesting game, love the puzzles and the graphics. The soul mechanic is really creative but I think it would be much better if souls didn't just go in a line and get lost sometimes, instead they could just follow you (at least the ones you get from robots)
Also shooting in the direction of cursor instead of where character is facing would be much better, I had to reset the levels a lot because I wasn't paying attention to where character was facing.
I know these might be intended but just some suggestions.
Other than that great job.
Edit: Oh I Just remembered doors were a bit glitchy, I had to reset level on the door in second level and had to go back and forth a few times till I was able to go through the first door.