I understand your doubts, I'll try to clarify as much as I can, just to explain the situation to you.
I'm an Italian developer who has mainly made games with RPG Maker. Soul's Spectrum was born from a jam (IGMC) I did last year and since it was a competition some of my friends supported me. The comment you linked is from my sister and there is also the subsequent comment from Javarnanda (who is the musician in the game) who wanted to express a positive comment. Some comments from my other maker friends, like michael, may have errors as English is not our main language.
That said, the jam went pretty well and, following the comments received, I wanted to expand the demo I created into a full game. Over the course of these months I have worked really hard and a few days ago I released the prologue. As you can see the situation on Steam is different as these are reviews that are clearly fake, from people I don't know. For this situation the only thing I can do is ask for clarification since I can't delete these reviews. I'm the first to be sorry if the game will suffer as a result.