These set of questions/answers should help with tons of stuff, so I'll put it OOCly rather than PMly.
1). What would you say would be the "normal" galactic technological levels, so I do not make anything super over-powered?
Normal galactic tech levels, in relation to the Galactic Empire, would be...Faster than Light travel, wormhole creation, reactors that create artificial suns, mechas that are so large that they can house planets, missiles that go into the past because sweg, humans who have become totally online...basically, everything is so God-like it's pretty much all in the realm of WTFmagic.
Normal galactic tech levels, in relation to the Malstraza Solar System would be...mechas are common enough to be used effectively for work. 3D printing is extremely common, and a lot of things are pretty much automated. Railguns and plasma weaponry are both top-tier. Nanobot technology exists, but they are incapable of replicating, and are extremely expensive to manufacture. Cyborgs exist. It's possible to save any life, as long as you have the proper facilities. Diseases are pretty much no problem at all. AIs are smart enough to be able to develop personalities.
They still can't bend space and time though, and the main problem is that they lack massive amounts of resources, compared to the Empire.
2). What am I limited to?
I would prefer if whatever you made/had wasn't super high-tech and stronk. Things are going to get destroyed, lost, stolen, sold, or whatever else in the RP, and it costs money to replace/repair them. Basically, I guess, the trade offs would be something like...
If you have a super unique, super powerful mech, prepare to be eating cup noodles for the next thirty years after paying for repairs for it.
Basically, I'd like to have a sense of 'levelling up', by using spare cash to upgrade your rides or weaponry, instead of 'levelling down', by having to get scrubbier replacements for missing parts on your battle-scarred mechs.
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In relation to technology levels of your own planet, it'd be nice if they had some area that they neglected, because they dedicated all their attention into specializing in something else. Generally though...
No absolute control of time/space. As in, no warpgates or FTL, pls.
No 'perfect' immortality, either through cyborging or uploading your brain onto the web.
No giant walking-fortress cities/islands/continents.
No 'scientifically creating nothing from something' or stuff like that.
After that, everything's up to discussion.