My best advice, just work on it when you can and release a completed version, regardless of how long it will take.
Releasing small chunks will result in people spamming about 'when update ready' and being annoying. Also, if you went this route, you could end up burning out and dont want to work on it anymore, leaving people disappointed that the game is incomplete/abandoned.
Releasing a completed, full version like a year from now, everyone will flock to it and play it, trust me. With how little we get new games and/or updates to ongoing ones, yours will receive praise.
If i were you, I would just disappear while you work on it, and randomly drop a completed version out of no where lol. No updates, no ETA, just silence.
Of course, if you want peoples opinions on content in the game, then you couldn't really do that i suppose