Your various ultra-short demo games have been charming so far in a sorta amateur creator with some obvious fetishes just making what he wants way. I've even reviewed them mostly positive before for it. You're actually a pretty alright renderer even if your content writing abilities are weak.
But charging $20 (and fucking $50?!) for one is honestly insane and going to rapidly shift peoples perspectives of you into being a content-farm scammer, especially with this being nearly the exact same game that was free for years. Like I don't want to be too harsh here and keep this within constructive criticism, but I also think a bit of a reality check is in order here: this title is barely worth the effort of unzipping from gofile for free, let alone paying $20 for, and if you charged anyone $50 for this, you scammed them.
People are not going to trust any promise of future content with the amount of v0.1 half-abandoned games you have, and even if you know you're gonna commit to this one and make it at least UFO's length, you just don't have the record to charge people up-front for that promise, and $20 would be too much even if it was fulfilled.
Overall my honest feedback is that I think you're ruining reputation with this, but take it for what you will though since I'm not a paying customer. However I say all this and didn't just scoff at it in silence because I do think you have talent in some areas and have a lot of room to improve.