Few more things:
When you have the backpack equiped then you fill it up, if you switch the backpack out for something else it deletes all the extra resources you had. Not really a bug. But maybe don't let the player waste resources somehow, don't let them swap the pack out or make them empty inventory first or something.
Can't use abilities while moving. Doing so sometimes causes them to bug out and run in place and not move.
I also suggest making it so when you use an ability it just activates you don't have to place it down. Takes too long and by the time I place an ability or two the fight is over.