I really like the sound design, and the concept is cool! I actually tried a similar concept in a past project, but from experience, it's pretty hard to balance. As a result, you often end up just waiting for the vegetables to grow. Maybe adding side objectives (like money spawning on the map, for example) would give the player something to do instead of just waiting around.
Also, on my first run, I ran into a bug where I didn't get any money, which made it pretty tough to progress!