Very fun! I think a lot could be done with levels in terms of pathing, being blocked from certain bits of food depending on size is very clever. I like that you have to learn a "optimal route".
I like that the resource for completing the level is the same as buying upgrades, but at first it wasn't clear how I could buy upgrades or what I needed. I think "you'll lose the spend value" is supposed to indicate this, could possibly be worded better.
Overall great job, solid level design that made me think about what food I pickup first.