I like the combat! It felt good! I also like your game graphics! Although, there are a few suggestions that I can think of that could improve your game. It's mostly grammar-related. Otherwise, you are on a good path!
For the Quests when talking to Maria:
-"Avaliable Quests" should be "Available Quests" <-- just switch two letters around.
-I believe that it would make more sense to change from "Complete Quests" to "Completed Quests" <-- this can throw off some users very easily at first.
Some grammar suggestions:
"We hope for your success in this mission."
Nene:
"Oh, hello adventurer! I hope you have a good day!"
"Be careful out there. Even if the mission seems easy, one small mistake can cost you a death. "
"I believe you should talk to Maria regarding your quests."
Leyla:
"Hi! You better make sure that you eat well and stay energized during the fight!"
Yellow Crystal:
You don't have to take in my wordings for this quest--
"Lorem Ipsum is simply a dummy text of the printing and typesetting industries. Moreover, it originated when an unknown printer took a type of gallery and converted it to a specimen book. This type of book would typically include the specimens' vital information. Lastly, Lorem Ipsum became the standard in the 1500s due to its positive outcomes."
The only suggestion I can think of that is critical:
-You should make a menu separating Configuration settings and "exit to main menu" instead of putting it all together. For example, you can make the pause menu that includes "resume game," "settings," and "exit to main menu." You can use "Esc" as your button for it.
I'm suggesting this because it's a standard input and purpose.
To be honest, man, I can be your overall tester! :D