Great choice to have the arrows pop up to teach me that there's a fog of war mechanic. It seems like a little thing, but most jam games would overlook something like this which would result in a lot of players quitting before doing much at all. You make really good use of it for teasing exploration, too.
I got stuck after the first collectible and couldn't figure out where to go. Downside of the fog of war mechanic like this is it's easy to miss something and not know it. It may be worth figuring out how to do landmarks or some sort of signifier for goal destinations without revealing the path there so I at least know which direction to look in.
Really smart to keep scope this small for solo dev.