I did consider adding sounds, but I have decided against it - while the extra feedback for what's happening would certainly be nice, I felt I could as easily ruin the experience with poor choice of sfx.
I do have quite a few ideas for more mechanics, as well as a metaprogression system that let's you improve between runs on many different towers, but whether anything will come out of this will remain to be seen - real life and work being quite tiring is certainly something that may stop me here from getting a post-jam version to any sensible place 😅.