About the Skill Grid: First get the heal spell (only 3 points away), then focus on the right section first with its physical boosts like Atp, Def and Crit. Once you have unlocked everything there, work on the Magic section towards the Revealer spell. Ignore any Attack Magic that would cost more than 1 point to unlock. After getting the Revealer spell, move towards the upper left. Transmute spell is very useful if you can't find any other decent permanent gear. I found Crafting to be quite useless, since all potions only temporary boost your stats for a very limited amount of time.
Quest III: Play for 4 hours. Yeah not gonna happen. Overall terrible interface and also no option to restart with stats boni, you are stuck with the game you initially started.
There is a bug with equipment, when you win stuff from the lottery that you haven't unlocked yet, it is still not featured in the equipment sets if you sort by stages and the percentage doesn't match as well since "new" equipment which you haven't unlocked through normal gameplay may still drop. And worse, you can't take off these "mixed" full sets once you equip them.
Once you have bought every skill, the only significant DPS increase is to level Aidith or soft reset. Either way is not satisfying because there is no new content past Lv 100.
Last boss kept hammering at my ship yet I finished the level with 100% and 3 Stars. It's also very annoying that you can't sell, scrap or replace traps that you accidentally placed because of lag.
The goal - to combine clothes you have done and funny costumes! Suits with the skills needed to pass only certain places in the levels.