Not bad, for something that's pretty basic.
Suggestions
- Have an indicator for when you have enough money to unlock the next food
- Change the reset to "inherit stat". Help mitigate some of the slog that is upgrading. Reward players who keep going for the legendary upgrades.
- Have all legendary upgrades listed as well.
- Have legendary multipliers apply after basic upgrades. So "fill count" upgrades don't feel as wasted after Legendary x32 Fill Count is reached.