Not bad for a first game! I thought the light shard and blindness mechanic were pretty clever. To me, the highlight was the story, including the little snippets of dialog and character development every round. There were some funny parts, and seeing the story surrounding "Reid" was enjoyable to uncover. There were definitely some typos, misspellings, grammar problems, but nothing so bad it made it unplayable.
Biggest thing to be improved is gameplay. Despite the blindness aspect being clever, in game all it means is using an eye drop every few minutes. That doesn't make for fun gaming. Light shards were fine too, but why not just have the inhabitants be demons to start? Having to use an item runs the risk of running out, and I really don't know what one would do. I didn't see any way to farm lightshards.
Combat was a bit one dimensional. I typically just attacked until enemies died and didn't use spells until the final boss. Harold's spark was weaker than his attack, and so was Therese's Ice attack. Skills without a use aren't exciting to have.
Having to equip a pickaxe or fishing pole to fish or mine is a bit cumbersome too. It added a bit too much menu exploring in order to do things. I think it would be totally fine to just check for the party possessing these items to allow you to use them, because no one wants to accidentally bring a fishing pole into battle.
On top of that, fishing as spamming confirm button is not super fun either. Definitely needs some mini-game, some skill, or even to not exist (I'd be okay with that).
One of the biggest problems for me was the total lack of poison antidotes (as far as I could tell). Because it took me a little realize I had to equip a fishing pole, I accidentally used bait on Harold. He was poisoned for the entire run. No shop on the way sold antidotes, no enemy dropped them, so I was just making sure I healed before battles.
Anyways, I wrote all the above to try to help, and I really appreciate your entry to Harold Jam. Hope to see you make more stuff and keep improving!