The 75 extra health doesn't kick in until you reach the first holy mountain. The heart containers are empty. It's up to you to fill them up. That's why I was hoping for a mod that spawned you with the orbs rather than a mod that simply gave you extra health, cause starting with an extra 75 health gives you an unfair advantage in the mines.
I'm sure there are some debug tools that simply allow you to spawn orbs.
This is true, I did see a mod that just spawns 3 +50HP hearts at the start of the game, so you'd still have to fill them, but your orb count wouldn't go up, and you could still collect the orbs. It's pretty close, admittedly.
So I used my laser hose to dig around, and fought the alchemist boss. I cheesed the hell out of him by drilling up from underneath and shooting him through the little slots I dug. It seems his reflective shield doesn't keep the trigger part of the spell, so even when one or two came back at me, I only took 8 damage instead of a couple hundred. Still, I had more success with a triggered lightning bolt than my machine gun wand. Got the alpha spell from him, so I now have unlimited uses of any spell, as alpha will happily copy a spell with 0 charges and cast it for 30 mana. Still no healing spells found.
Kept going west until I hit the border wall. My laser hose made short work of the wall, although it would have been faster to use black holes. I wasn't used to infinite black holes yet. A quick spritz with ambrosia and several teleports later, I was on the other side with full health. I really expected it to be harder somehow. I highly recommend heading to the parallel worlds the moment you assemble a toolkit. Ambrosia, digging method, and teleport are the safe way. Teleport is good to have anyway because otherwise it's a long hike. Just pouring ambrosia at my feet took about 7% of the bottle to stain me, and if you dug a little pit you could probably do it with less. Either way, a bottle of ambrosia will go far if you use it that way.
I used my ambrosia to collect several corrupted orbs. +50HP each, ambrosia blocks the crazy poison it gives you. Then I just dove down the mountain, got a +50% health perk, now I've got 1100 health. Collected a nice storage wand with 26 slots, I'm so glad I took the tinker anywhere perk. I got oil blood, finally got fire immunity. Found two freezing charges, although I'm not sure it's worth using anymore, enemies who can be frozen tend to die real quick anyway, and those piles of snow everywhere get annoying...
Accidentally went through the portal at the bottom of west vaults, oh well, might as well finish the main dungeon and kill the boss before I collect any more orbs. I've got 11 now, much more than I meant to fight the boss with.
It was time to end it for the night, but I was curious so I made a backup and tried the boss with the wands I had on hand. It was slowgoing, but if I could bring my machine gun wand to bear his health dropped at an OK rate. I realized I should have drilled a loop to kite the boss through, it sucks getting cornered by him and having to run past, took a good amount of damage that way. I had him down to about 3/5 health when he hit me with a polymorph orb at point blank range and my own machinegun did the rest. I guess saving grace and extra life do nothing when polymorphed? Kind of stupid...
So... clearly going to have to build a more damaging wand. The boss's shots go through the wall, so I couldn't cheese him like I did to the alchemist (although maybe his polymorph shots would still get blocked?). With 1100 health I could afford to take a lot of hits, but I couldn't just tank his shots, I'd go down first. I have a single heavy shot which is attached to the payload on my spitter bolt with trigger machinegun, so I'm doing around 60 damage per frame, for 3600 DPS. That's been more than enough elsewhere, but clearly I need to step it up.
I suppose a fast path to more DPS would be to swap out the spitter orb payload for a triple shot, tripling the heavy shot damage. However if I do that I won't be able to fire continuously, although that's probably fine. What I really need is a fast wand with a lot of slots. So I should probably try out the tower, and maybe I'll pick up some good spells.