Hey Bara it's my first time to write something long like this... It may doesn't be written well but I try my best. It takes me nearly 35 hours to finish. I'd like to say it's a good RPG game but I think there're many points can be adjusted. Let's start with the bugs and issues I found.
1.Guard
Guard can't last long till the guarding character's next movement. It just ends when the action roll above finishes a round.
2.Menu
"Items" block can't jump to "Game End" block when you press left arrow key. And of course "Game End" can't jump to "Items" either.
3.Ship
When you cancel the dialogue with Captain Gordon, he'll travel you to another place. As far as I found: Arcius to Volcanic, Volcanic to Arcius, Regull to Volcanic.
4.Mega Potion
After MC synthing a Mega Potion, the green number of healing just display a fixed value: 150 and it practically won't heal for this little.
5.The box in Arcius Ruins
It's an interesting issue and it happened when I went smooth in boxes pushing and it happened. Then I tried a slow one and it went well. Plus: "Go smooth" means press arrow key and "Z" key continuously and maybe sometimes press at the same time. It just like playing Street Fighter on keyboard. You know what I mean.
6.Particle effect
It seems that particle effect will stuck in screen sometimes. I couldn't help much because I don't know how to make it happen again. I've been through Blink-effect stucking and Light-effect stucking for now.
7.Action cancel
When paralysis or confusion cancels character's movement who is going to spell magic or synth, the consumption of magic&synth wouldn't cancel along with them (I've lost many high potions and some critical AP points in this one lol).
I think maybe it's because the consumption codes have priority over cancel codes.
8.Weapons' spells
The chance to release spells through normally attacking enemies is a bit too low. But once it releases successfully, it'll cause a disaster to enemies. What's more, it seems the spell's efficiency is related to caster's Attact, but not eveyone's Attack&Health is high enough to pays several itching normally attacks and gains a tons of damage from boss-rank enemies (That's right, I'm just mentioning you, Su). There are so many cool skill right? such as Star Fall deals a great damage to one enemy, Earth Barrage gives you a efficient way to clear the battlefield. But Weapons's spells can do that all and it's way more efficient despite its low chance to spell. So I think it's not very balance in there.
My personally opinion is, I would like to add a special one which influence on the spell's casting-chance or damage to allocate in "Stat Points". And reduce the base damage it causes a bit.
9.Synth Soul Breaker
It's cause a very very very explosive impact on enemies. I was shock when I saw Mortimus' health bar at the first time. it's impressively longer than the darkspore demon which took me half an hour to take down when I hadn't got Synth Soul Breaker. Then I try the new super skill on Mortimus and...he lost half of his health. After this, I continued in guarding after guarding and he couldn't make much damage to me... and when I had enough AP again, he died.
I think it's OK that it's everyone's bond skill which presents the memory of along the way they've been through, and it cost everyone's 300 AP after all. But compare with the 30-min darkspore demon, I feel a little void after defeating the final boss in this way.
Maybe its impactful damage comes from lots of critical damage it can brings, and Mortimus can't stop me from guard-skill-guard action cycle because I have average 3500 hp there and his best aoe skill deals just near 600 per person when I guard. Plus I'm level 46 when challenge him.
10.EXP
the level between areas is a little too high I think. The level gap needs synth weapons to fill, and weapons need materials. Then to get materials I need taking monsters down but it's difficult and monotonous because the level gap and low drop rate of critical materials. So another choice is purchasing them from markets, but it need golds which mainly come from monsters. What's more, it seems that you can buy Mythril Ore in nowhere unless fighting in Arcius.
So in my opinion, lower the level gap especially when it comes to last half part of story is an important key to get balance.
It's a good RPG game, I enjoy the 30+ hours while playing this game. There are many interest puzzles and map designs. The block puzzle before the element spirits is my favourite one and I even want more puzzles :D
As for the map designs, the stones in Deep Canyon to push remind me of the Pokemon Platinum's Mt.Coronet's stone lays on south of 211 road entrance. The one-way pass design is interesting. And the Tutorias reminds me of Nurse Joe in Pokemon animes lol.
I genuinely trust you have the ability make even more better game in the future on account of this fantastic Etheria you've made.