Fun game! I enjoyed the Scooby-doo quotes. The gameplay was fun and easy enough to get into to make the game super fun. Often times people make the base upgrades take to long or to quick in games like this, but you happened to hit that perfect middle ground where everything flows perfectly!
If you wanted to improve I suggest adding some particle FX to the game, footprints or an animation when collecting food could add a lot to the game feel.
Overall, cool project!