Yes you're right, I'm afraid that if you don't reach the 100 followers before Saturday you'll be skipped from this round. I agree that it's not healthy for the people who just created the account to grow it artificially in just a week not to be skipped and I think a 2 weeks deadline would've been much better but this is the way they've decided so have to comply.

On the project's Discord channel there are a lot of people sharing their links to twitter in the off-topic sub channel, if you need to grow your followers base you can go there and follow the links for a follow back; it's much a better solution than using popular hashtags that eventually will make your twitter tremendously spammy, but I don't know whether it will be enough only with this.