not to be annoying, but i'll ask one of a long shot questions: would you actually make remaining scenes for intros and good ends after you're done with all the mechanics or even after completing all 5 games? Either by yourself or via commission to another artist is fine, we get it.
After completing everything else for GT? No way. The reality is I'm under a constant rolling time crunch: selling a game gives me runway to make the next game, which gives me runway to make the NEXT game and so on. As-is, it's a bit risky just doing the additional content for GT, since I'm burning time I should be spending on 3. Thankfully, the support on SubscribeStar helps with this somewhat, and I want to make sure the game is content-heavy enough for people to enjoy and more or less matches my vision for it and what I initially proposed. But time is always a pressing concern.
Now, the hope is that the runways will get a little longer with each major release, as more people hear about the games and there are more games to buy. So is revisiting something like visuals for the intro and outros possible at some point? Sure, maybe. But certainly not for a while. And contracting/commissioning work has its own issues. The core stuff has to be me, to keep the visual identity of the game contiguous. But there are things I'm open to paying for help on, and even there it's tricky to actually make it happen. I've been trying to get a few pieces done for GT for example to go up on e6, FA etc in order to get the word out, but I haven't been able to find anyone who'd be a good fit in terms of skill and style and is actively taking commissions.
But, long story short: right now, no. In the distant future? Possibly.