Thanks so much for playing. I really appreciate it!
It sounds like the reactors were confusing and you weren't sure what to do. That totally makes sense. I thought keeping the explanations simple would be fine, so that was my mistake.
If you can gather H to make H2, just follow that same logic and try placing an H2O reactor. The O should be unlocked, so please take a look at the screenshot I attached for reference.
- Turn H into H2 using the first reactor
- Combine H2 + O to make H2O using the second reactor
Once you do that, H2O is produced, so you send it to the core. I'm guessing that combining reactors like this might have been a bit hard to figure out.
You've probably already done step 1, so I'd be really happy if you could give step 2 a try.
Also, if you place argon gas, H and O will recover (by about half), so it might be good to make use of that as well.
As for the reactors being locked, they unlock sequentially as you clear the current stages, so you shouldn't get stuck where you can't clear it. But it definitely is a bit hard to understand, that's for sure.