Let me add a couple.
Hot Pouch needs to have slots 9 and 0 added. It might not be useful on a controller, but it's very useful on k+m.
Craft a parachute out of 3 clover leaves and 2 silk rope. Make it repairable using one of each resource. Upgrades/replaces the dandelion.
Backpacks should be upgradeable, too. T2 and T3 add another line of inventory slots.
Trinkets should appear in a 'Trophy Case' as they are found and unlocked. This way all players can pick which one they want to use and they can't get lost.
Swapping to a 2H weapon after using weapon and shield and having a full inventory. ....UGH. This needs to be fixed. Suggest making the hot pouch the weapons pouch with weapons and shields returning there instead of into the backpack.
Canteens shouldn't have to be in hand to drink. They can be used directly from the inventory screen. Allow a key to simply drink as long as the canteen has drops in it.
Change the charcoal canteen to 8 drops, double what the T2 Canteen + holds.
A compass. My kingdom for a compass.
Depth of Field. Measurements are in centimeters. Eyes can see very clearly for distances far beyond that. Remove DoF blur. Just because the player is smaller doesn't change the design of the eye and make it more like an animal or insect eye.
The firefly helmet is all but useless in combat with it's tunnel vision lighting; it actually makes seeing the mobs more difficult as the light swings wildly with each attack motion. Moving the firefly light to the top would give the same light radius as a torch.
Bonus suggestion new head armor goggles. Night vision. Moths, as well as some bees, have excellent night vision. *hint, hint*