Some tips and opinions for game.
For Zack pick Force Shield and raise cunning, For Diana pick Time Alter and raise combat.
Warp Strike is useless outside of first dungeon ie in first dungeon it does 15-25 damage but it only does 4-9 afterwards(and sometimes stun) there is plot explanation for that which is nice i guess, warp strike also doesn't work in middle row in which Diana always should be thanks to her garbage defence stats. it's better to struggle a little more in first dungeon but breezing through rest of the game.
I picked warp strike for both first time around and spent 7 hours to beat game as result. Tried with Force Shield and Time Alter and struggled in first dungeon as i said but afterwards first mini boss that took like 5 tries with warp strikes, was easy as pie.
Disrupt is okay magic attack skill but cooldown is too much for little damage it offers
Reinforce is heal so good second skill if you play without max gold, if you have plenty of better health potions disrupt for extra damage is better.
Acid Flask is really useful it will do more damage than most of non time altered characters. I spent like 200 over course of game.
It still can miss for some reason(reason is stupid MV battle engine)
Choices matter, it might be better to be good and get less reward so it won't bite you in the ass later.
Game is too grindy so it's better to cheat gold. I really advise that because there will be large sections with lots of battles and no shops to resupply so if you run out of heal potions you are fucked. Game really needs rebalancing.
Aside from awful idea of making night being pitch black with small circle of light around hero and torches near living places, dev really need to change that, i quite liked game hopefully it will become more popular, story is really interesting and it quite refreshing to have brother and sister who behave like brother and sister and don't want to fuck each other(yet)