In terms of development time, it has been. As for playtime, It's honestly kind of hard to say at the moment. I hope so. SpunkStock's playtime was often dependant on how far the player wanted to go (Like getting SS on all characters, doing the gauntlet, etc.)
Starbreed has a bit more of a set pacing to it. Characters have affinity to build and such. Even though I'd like for this game to take longer to beat than SpunkStock, I definitely want the Hscenes to be dense enough.
I think this will be quite a bit longer than SpunkStock in terms of playtime, but I won't know for sure until it's done.