Hello! Dev here. I created the game we are talking about. I can answer this question, as I get it a lot.
There are several reasons why fangames aren't made for consoles.
Making games for consoles is infinitely more difficult than PC and can require proprietary development kits that a non-professional fangame dev is not going to have access to. Or you use some homebrew trickery that is next level. I understand this a site with a lot of content regarding homebrew but homebrew is not always mainstream to the average dev or "person that just wants to play a video game." And let's say that as a dev, you get your fangame running on a console. What are you gonna do with it? Upload it the official store of the console? That's never gonna fly. It's a fan game. So then you that means you've gotta have a homebrew solution that requires users to crack their console. And since not everyone has the skill or time to do that, you've now greatly decreased the amount of people that are going to even be able to play your game that you worked so hard on.
What about retro consoles? Like putting it on a SEGA Genesis? Well now you are dealing with a dev environment from 1990 with an ancient console that has HARD limits of memory and processing power. I can't tell you how much easier it is to make a game in a modern IDE, especially when, as a fangame dev, when you are just doing it for free in your spare bedroom. You aren't making any money from this, it's hard to justify the amount of "banging-head-against-keyboard" time it would take to get your game running on a certain black box over a different black box. That's why any of the fangames that do run on console are usually ROM hacks of existing games, but even that is a different skillset that requires combing through someone else's code written in a coding language no game programmer is using anymore.
In other words, putting a non-licensed fan game on a console is a mega hassle that simple isn't worth it just so a small number people can feel more comfortable playing it on a certain computing machine over another computing machine. Cause that's all it is at the end of the day. Level design, controls, art, etc, are the things that make games fun. And those things are fun regardless of the machine it is played on. I prefer playing games on consoles personally, but it's just simply impractical to get fan games on consoles for so many reasons.