Our mc gets involved with the goblins who took her sister as their goblin wife. Thus, she decides to travel to the goblin world in order to save her sister. During this, she comes to learn more about the goblin world, as well as her forgotten past memories about this place. It has an interesting story plot, but I prefer binge reading this type of stories. It is good so far. Oh, this is also shoujo, so expect some romance involved. This isn't rpg-like either; idk if this belongs in this list
When someone pushed our mc off a cliff in the game, she gets transported to another fantasy world. She can still access some of her game inventory, but she has to start at a low level again. She also learns that she is unable to log out, so she is stuck in that world. It's shoujo, but it doesn't feel like it (yet?) since she focuses on leveling up and adapting in that world. I like how the mc is slightly devious and strong-willed, so unlike many shoujos, she isn't bothersome.
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Hey there! I like the RPG-esque feel to manga as well. I clicked through your list, and here are some that I didn't see. (Ones at the top are my most liked!)
I hope you enjoy~
*** http://www.mangago.zone/read-manga/spirit_migration_01/ (personal favorite next to OSO)
http://www.mangago.zone/read-manga/tensei_shitara_slime_datta_ken/
http://www.mangago.zone/read-manga/log_horizon/ (The anime is excellent, but I haven't read the manga yet.)
http://www.mangago.zone/read-manga/to_aru_ossan_no_vrmmo_katsudouki/
http://www.mangago.zone/read-manga/remonster/
There's actually one more that I forgot that's really good, and definitely worth reading if you have time! (I'd rank this tied with OSO and spirit migration.) It's less of the linear RPG-esque, but has many of the same elements.
http://www.mangago.zone/home/mangalist/90967/?filter=manga
Wow thank you so much for these suggestions! They all seem interesting xD also I wanted to say that slime and remonster were already part of my list, but it's ok ^^ i've also watched log horizon and I enjoyed it as well. Speaking of which, yea, I think it is good to read the manga too eh. I'll definitely check these out! Thank you again for telling me about these ^^