I've been thinking about joining this for one of several projects (< my problem finishing projects), and I had a couple of small questions.

1. I have nothing I genuinely believe I could finish in a month. Is great progress cool too?

2. Are novels okay to submit?

Yes to both, we've had a lot of novels & text games over the past 4 years.  You can submit an alpha or work in progress too, if you've added a lot to it and want some feedback then go for it