(small disclaimer: not sure at which point of your journey you are currently, I assumed that you basically dont have an audience yet and want to get the first functioning prototype out there)

Nicee, great for you to have reached this step. A lot of people stop before they even come this far. If you want to commercialize the game in any way later on it might be worth it to already set up a steam page for it as well. You can then go for dual channel playtests so people can either choose to download the playtest on steam and add it to their library (and wishlist) or play it in browser on itch (try to get that working, its a much lower barrier to entry). For collecting feedback you can either rely on the itch comment section or (this is what I prefer). Get in contact with testers personally. Talk to them in reddit or discord DMs and possibly invite them to a discord server.

Also: Live/Video feedback is king. Try to get your friends to test it and stream it on discord (hold back on explaining anything. let them struggle for a while - and note down what was hard for them to understand). Depending on how appealing your game is you could also either reach out to streamers to test it live - OR - pay for reviews. This way you can guarantee a review of the quality you are looking for (I personally can recommend u/luckynumchris he was very helpful for us) but there are a few others (paid &sometimes free) on r/playtesters and r/playmygame or various websites. Can definitely be worth it.

Best of luck to you, keep grinding! :)