Thanks for the comment. I've added controls to the project description.
Yes, the ability to exchange unused items for metaprogress currency is one of the features I didn't have time to implement.
Items in the storage were supposed to show a tooltip displaying the item's unlocked abilities, but I didn't have time to implement that either.
There were also planned to be significantly more than eight items, but I spent a lot of time implementing the inventory, as this was my first time doing it. Overall, I realized I chose a project with too broad a scope for the time I had.
In any case, thank you for your feedback and interest. It was helpful to see that a player shared my point of view.