I've alread maxed out every member of my crew but keep loosing in the final level.
P.S. How to interact to bag of items during battle scenes?
I click on but nothing happens
not sure if you can use items mid-fight.
as for losing in the last battle, I had that issue too at first. You're supposed to upgrade your ship and have more characters to use at once. Probably have to upgrade it only once to be safe. It might be possible to beat the game with just a 5 party member limit, but it definitely makes it WAY harder. Especially if you don't have a healer and/or brawler that you hire (brawler giving temporary invincibility and the healer well... healing). Also, use the equipment from the most recent town or cave you unlocked cause it's base stats are needed. The higher the equipment level and rarity, the better.
Also, skill cooldown on your healer and/or brawler is crazy overpowered, even with weaker equipment. Just don't put them in the front column with weaker equipment or they'll die fast.
But have to point out that with 1 ship upgrade, you can use all 7 permanent characters you get. And with both upgrades, you can even add 2 hired/capture characters with them. all 7 of them together with 1 brawler and 1 healer is pretty OP. Or you can go 2 healers or 2 brawlers... whichever you can find of gold rarity first, but purple rarity is still good.
Also, having sex with the girls ups their stats permanently, along with the MC. equipment multipliers can compound off this.