We still had some things we wanted to do with the game, one of those things was the balance. Uploads are locked because it was a jam submission, so we'll have to see how we'll go about updating it.
We were planning on adding that, but didn't hade time to completely implement it. Same with the tower size. That's why there's options for that in the menu that can't be altered.
Edit: Added a note about this in the game description.