I feel this. I paid about $25 total, which was at the time, to get my name included in the credits.... Never heard back from him funny enough, and multiple people had the same. Over a year since this was "nearly there." With no word back. Honestly think it's a con at this point and I've wasted $25.
Read the comments two months ago and it's clear he's still working on the game. If it was a con, he could just have pretended to not see all these comments, but instead Adam Dubi replied with a very long and detailed response about his current progress in the game that is obviously not just fabricated.
Also, the sheer amount of detail and passion that is on display in chapter one alone makes it pretty clear that it's not just some scammer - they would try to maximize their time by making something a lot less detailed.
Maybe read my comment and then try again. I said scroll down to two months and read the dev's comment. And if you actually played the game, you would realize this guy isn't exactly your average developer. He's not the most communicative but he makes up for that with how insanely talented he is at game design. You play the game and tell me another game made by a single person that's higher quality than this.