Hello! Thanks for all the tips! After submitting this game to the jam, I still had a few days to work on it and most of the things that you said (not all of it unfortunately) was added to the upgrade. I do not have access to MZ anymore so I am considering starting over in MV for a longer and better version of the game.
I don't know if I can share what has been added in the upgrade because it might influence the judging but there is quite a few changes.
About Moon in the jam version, if you decide to rest, he actually says "it was just a joke" and he doesn't actually charge for it. There is another way to heal yourself by going back to Sun.
I didn't know what to do about the SFX at that time, but at least in the upgrade, not all the sounds will start at 100% in the option menu. (I think it's ok to share that)
I couldn't add more URI illustrations because it would take me 3 or 4 days to make one (If I am only working on that), but I will add more in the future. I actually took the first week (and maybe 2 or 3 more days) of the jam to work on the face set, the walking sprite, etc... With no time constraint, I can go all out (Well life happens too but I can give it my all).
For the last boss, I felt like it was a necessary challenge... I agree, maybe too challenging. The player is somehow cruising through the game all the way to the end without ever seeing a game over. Since it was the final boss (almost at the one-hour mark), I felt the game kinda needed that so the player appreciates the ending more (because it is a short story, a short game). The narrator kinda hints to how challenging it is and how to beat it by adopting a more defensive approach. For that one, in the upgrade, I didn't nerf him but I gave the player a way to ease through that fight.
I am really happy that you enjoyed it because it is actually my first attempt at really creating a game. I had MV for a while but I was just playing with it for a month or two, and then just left it there.
Thanks again for all the feed back, I am actually competing alone against teams of devs in this Game jam so I don't want to get my hopes up but having a judge say that the game could be a skeleton for a commercial one it 's just amazing and already rewarding enough for that one month worth of work.