I think unless OOO is gonna make some kind of profit, this idea will be going through the a pretty hard selection process.

But it's a little interesting, but i would rather the monsters stay enemies unless there is some lore drive. Content to give them a neutral role. Cause i feel sense we already have so many help when it comes to battle like the pets, knights npc from haven, robotic knights, stationary turrets, battle pick ups, and so on. i would rather the minerals boost and multiply the monsters that resonate with it in that particular field and makes them more dangerous with new attacks. And once we pick up these minerals, the boost will disappear so that way breaking and picking up a mineral will actually co..ect and correspond to the levels were running and connect to the monsters were fighting. So far the game only has lore connection when it comes to monsters and minerals and that is something i seriously hate when there is only lore connection on a game and that actual coded connection is not there at all. Anyway this is my spin on your idea because i don't feel we need more helpers, rather more challenges is what we need.

Also, sometimes the weapons are cursed

"Sometimes?" When was the last time a weapon you needed was cursed?
When was the last time a weapon you needed was cursed, by no fault of your own?
If all your weapons are cursed "sometimes", you need to start shielding against Phantom attacks/Stop spamming GF when you don't have any curse resist or 3rd weapon slots

or it does damage that the enemy is resistant to.

There's an arsenal station on every single floor, you have no excuse to bring weapons the enemy is resistant to. Even if you did bring the wrong weapons, it's hardly courteous to just be a drag on your team by not contributing with any attacks, just letting your slime do all the work.

Friends usually are offline or busy with their own missions.

Then find new friends. What's the point of having people on your friends list if they're always offline?

Turrets, mecha knights, those demo pickups, etc, are hard to find and usually saved for its rarity.

Did you ever consider why this is the case? Perhaps it's for that mystical thing called "game balance".

That sounds like a personal fault. If you don't have a wide or varied arsenal, that's on you.

And for minerals of sorts...? Yeah, probably not a great idea. There are plenty of players who have even more minerals than I, so let's say no to those attracting a combat ally.

I remember multiple times that our party ran out of sparks and failed. Don't say," Get sparks, then," because both of us know that those require energy
Then play on lower difficulties so you don't die as easily. You'll still make crowns that way. Don't go places you can't handle without sufficient backup. The more often you play levels without dying, the more sparks of life you'll be earning as when you don't die, you don't lose sparks... And you find sparks in boxes. It's a vicious cycle that can go many ways, but it should start at the "don't die" part. If you die a lot, the answer isn't to keep going forwards... It's to stop and ponder why.

It's not hard to make friends. Talk to people in Haven, join public arcade lobbies. Unless you radiate hostility, you'll have people to play with. Adding random people is weird, but making conversations with people? Not so weird. Heck, just shout "Need someone to run arcade with!" and you'll get plenty of players willing to help, as long as you're in a populated area.

This suggestion seems to mostly be a personal problem on levels more than one to enhance the game.