I would absolutely love a key and of course I will continue to provide any feedback I feel is necessary for each update. Feel free to send me a DM when you reach the point you have need of more testers and I will gladly join.
Any time I have some time to kill between life trying to kill me I open up Incremental Games DB and check the New tab and if I don’t find anything interesting I’ll check the other tabs, including Updated and if I still can’t find anything good to kill some time, I’ll even check Unconfirmed (which is usually empty - the mods stay on top of things in my experience)
Alternatively, I hop on Itch relatively often (several times per day) after giving a lot of comments, if only to check for replies and address any issues that come up as a result of my feedback.
One little extra disclaimer that I always try to include when providing feedback (not bug reports, but requests/suggestions) - I’m just one of many, so take my opinions as such and not necessarily as a representation of the will of the masses. It’s your game, make decisions that you believe are best for the game and it’s community at large.