Very simple but cute game!
I had a hard time using the rotate button, and saw now real interesting decision in picking the constructions. Maybe I didn't understand, but they are free, right? You can just use a bunch of them
One thing that was frustrating me a bit is a lack of visual information for the area of effect of things (their hitboxes). You have to make some guesses when positioning the pieces, and then keep adjusting to remove some holes or unwanted spaces that you can only discover when a food goes there. Maybe making the visual fit better to the hitboxes and have some extra vfxs telegraphing sizes would make the experience smoother
It is very cute and satisfying to create a route and then it is great that you need to change the route for the new slime size when it grows. Great entry overall! Congrats!