The problem is that the video game market is horribly saturated. It doesn't matter if your game is good or not; what matters is whether the public even knows about it.
For example, if you check the "Recent" page on Itch, you'll see that the first page only shows games released in the last few hours.
Besides a good game, you need a good marketing campaign, and even that is uncertain these days. Every day I read about more people who have invested in marketing campaigns and aren't recouping their investment, simply because there's too much competition.
On Itch, there are a few niches that are much more successful than the rest, but in general, it's more of a developer's space than a player's, so the average game doesn't usually get more than a few hundred views, and very few of those will translate into sales or Kickstarter support.
I'm not going to say it's impossible to make a living this way, but I will say that the statistics are against you. The few people I know who manage to pay their bills with indie games are people who have been developing games for years and have created several titles, building a large and supportive fanbase over time. But achieving that with your first game in a short amount of time is very difficult (well, unless you do thorough market research and try to capitalize on what sells, but usually indie developers try to make the game they envision).