Leveling up should include extra storage
Every time you level up you are given additional crops that you can grow, however they don't provide you with additional storage to place the new items and upon leveling up you are required to produce these new items for achievements, with upgrade items being random and few and far inbetween you end up having to sell these upgrade items just to make room.
now I'm not talking about 25 spaces for every level however I would like to see an additional 5 storage slots every time you level up.