Inventory bug/unfinished feature:
Clicking on search filter should remove any text written or at least highlight whole text. (java has it done).
Closing the inventory should reset the search filter to empty. (java has it done).

Inventory hot keys not implemented:
Pressing number key while hovering mouse over item should move it to the hotbar corresponding location (java has it done).

Minecart collisions:
If a minecart starts moving, you can not block it by standing on a rail or even sitting in minecart trying to go the opposite direction.
It will only bounce from other minecart, which is illogical. It shouldn't bounce, just stop.