Haha the board mini-game was just a test idea, it won't be in the final game. I will try to hide the essence orbs.
There is a 1-2 seconds cooldown to save again, but I mean, why would you need to spam machine-gunning the save function \_(o.O)_/ lol
In the final version of the game, those belt-upgrades will unlock more slots to equip items. But for now it's testing purposes so all slots are unlocked from the start.
Thanks, glad that you are having fun!