I've tested on Android, works perfectly. The letters go outside the box in skills, the beginning area before you go the the library has no sound. I've noticed that the art for soraz? he's more outlined it clashes with the style of the other characters. I suggest maybe putting what type of characters we are able to play in the beginning, it's hard to allocate state points when you're not sure of the equipment you can use at the title screen. The grammar was understandable but it could be tweaked a bit in parts it's hard to follow along, I also suggest a quest log? It's hard keeping track of everything you need to do. Otherwise interesting type of VN it needs work on pacing since you overwhelmed with information from the beginning but I think with some work you'll do great :) side note - having an auto save would be nice before battle if possible, I lost a lot of progress that way.
1. about sprite art: thanks i will check it.
2. type of characters: there will be a lot of classes (and i had the concepts already) that depends on your stats, just go random for this first release, although, i put free scroll of wisdom that hidden somewhere to reset your stats if you are not sure about your points investment, but dont worry much about it. Here is a tips: Just focus on one main stat, it will always give you the best result (except INT because there are no magical damaging skill except Flirt)
3. grammars and tweaking : i will forward this to my partner, probably next release
4. quest log : does it really need? my way of thinking is people figure out by theirself, if they dont pay attention on the dialogue that might be difficult for them what they should do. It's kinda a no for me to apply it. If i actually apply it, probably just for the main quest, not side quests. To consider this, a walktrough may needed in future.
5. autosave wouldnt make the game more chalenging, in other hand, i dont want peoples upset because the game is too difficult. So, i will enable the rollback function on battle because its kinda annoying when you cant abuse rollback at the battle system right? although you just need 2 clicks to save the progress (only 1 click in pc/mac ver)