Sounds are very much planned! At some point, I will probably end up making a large soundscape update to remedy how silent the game currently is. Admittedly, it is not particularly high on my priority list; more content, UI rework, and finishing Part 1 are!
Similarly, regarding animations, I am learning how to animate, and I am making solid progress. Animations might be in the game at some point, but delivering more content with the current model is a lot more important to me now!
Finally, regarding outsourcing animations (or any other creative venture), I am not planning to do that. SP is my passion project, and I can't imagine handing it over (even only partially) to someone else. The only exception is more advanced coding since that is 1) something I don't really know much about, and 2) also something that has no effect on general style of the content itself. I already have a person who helps me with more advanced stuff, including the upcoming UI rework!