itch.io

That's the old system, although technically the new one is still an optional package. The reason I ask is because almost every Unity game I play that I have to download is pretty much unplayable because the horizontal axis is constantly pushed to the left, resulting in characters always moving left, etc. There's so far only one game on here that I found that worked and I wonder if they used the new system instead. I highly recommend learning about it. Here's the videos I used to learn to use it myself for this jam:

Brackeys Controller Input (also works for keyboard and mouse)

Samyam covers it too

There's also Brackey's original video about it, but it's from when it was an experimental release, so a lot of what he says is not 100% accurate anymore: https://youtu.be/Pzd8NhcRzVo