Gamedev City [0] is a new community and could be a good place for feedback and finding resources in general. As for sharing demos and collecting feedback I personally think itch.io [1] is pretty good.
As far as game improvement is concerned it's important to get in a growth mindset and keep focusing on improving the game, which it sounds like you're already doing.
Finally if you haven't already I would recommend creating a discord or some kind of forum for you game (itch.io has free hosting for them) just so you can collect feedback from people who are interested and invested in it.
I’d never heard of Gamedev.city, thanks for letting me know! I’ve already made a Discord server and a few people have joined, so I’ll try asking for feedback often while building
As far as game improvement is concerned it's important to get in a growth mindset and keep focusing on improving the game, which it sounds like you're already doing.
Finally if you haven't already I would recommend creating a discord or some kind of forum for you game (itch.io has free hosting for them) just so you can collect feedback from people who are interested and invested in it.
[0] https://gamedev.city/
[1] https://itch.io/