Can I get an activation key for this game and why do I need it :/
Only the restricted patreon versions require passwords. These versions are not publicly available and if you got it on patreon, that's also where all the passwords are.
if I subscribe, give me the activation key, send an me email ?
No, patreon is here not to get activation keys but to support my work.
If you want the game you can get it here on itch or on Steam.
It's literally on sales right now UwU