What do you mean by RPG? There is no combat, but you do develop his character, and interactions and options available to you are identified by you character build. There is certainly roleplaying and deciding what kind of character you want to be, and character react to it, and there are repercussions.
As I endorsed the game quite a bit, I think I would like to summarise my overall thoughts after finishing the game (no big spoilers, obv).
Game varies in quality quite a lot. I would divide it in my mind into three parts (Part 1, Part 2, epilogue).
I found part 1 simply fantastic. While I only did one playthrough, and can't vouch for other character builds, the game seems to constantly respond to your skill choices and in-game decisions. There seem to be skill checks a-plenty - both as traditional skill checks, but also enviromental detail and information feeding: your character will notice things, "skills" will talk to you, giving you unique tasks, and suggestions. It seems like this is the fulfillement of the vision designers had - it's a detective mystery which you can tackle in various different ways, and game responds to who you are and what you do. There is a tangible feel of progress, mistakes, and character growth/change. Pacing is excellent, with dialogues never dragging for too long, and for a text based RPG the game manages to vary things up and not be simply a wall of text.
It seems to be that part 2, is the part they run out of money. A new area opens for you and you leave with clear goal and couple promising leads. The game simply does allow you to follow on those, and story progression is locked behind single-skill check, with no way around. Of course, I might have missed something, but I did a bit of digging on the internet and it doesn't seem to be any way around it. Beyond this simple check, there are other things to do, but they are barely connected to what you do, and again, have little in terms of reactivity or freedom part 1 had - a lot of side activities end up with one very high, specific skill check required to complete this side story. This lack of reactivity continues, with certain even taking place, even there were many hints throughout suggesting you might be able to avoid it, and the investigation progresses not thanks to you. I imagine it is there to allow character who didn't do well up to this point to progress, but I felt it really sucked. In addition, it is confirmed that some skill checks are rigged - either succeeding and failing by default - not a fan. There also no fast traveling, and with bigger distances to cover (back and forth between part 1 and part 2 areas) I found myself wasting a lot of time.
Epilogue feels like a lengthy test. This is a massive wall of text after a wall of text, and a judgement day - you seem to go through ever single dangling story thread and tick it off seeing how you did. I found it extremely tedious and it became really annoying after a while. It felt like devs were cramming all the final reactivity they planned into small contained space.
Some stats: game took me 32 hours to complete - a fairly comprehensive playthrough, but to completionist - I turned out some tasks for roleplaying reasons, and left some tasks uncompleted due to skill-checks outside of my character build required.
I did find character build systems a bit annoying in the latter part. As changing your equipement is the easiest way to maximise your chances of succeeding a roll, constantly swapping your clothes before a check is tedious. I am still not sure how "thought cabinet" contributes to the game. Thoughts might unlock unique dialogue paths, but if it is the case, it is not clearly communicated, so I am second guessing. If all they add are small modifiers to your skills, then they are mechanically lame.
As a recommendation: Part 1 is fantastic, and I think it is worth picking the game up for that reason alone. As to the full price... maybe if you feel like supporting clearly talented new studio. Otherwise a sale. There are certainly more consistant titles you can get. for that price.