I have both, but have not announced them. Incubus Island will be very different from Incubus City in some ways, so I'd rather ask for people's money after I've had the opportunity to show at least some of the game. I don't want anyone to be misled. When I do get crowdfunding, I will likely use it to commission art, pay additional writers, get programming assistance, etc. Chances are by the time I get to it Patreon will no longer be a viable option so it'll be just SubscribeStar.
Can I mod your game?
You can do whatever you want to my game, so long as you have credit for me in your version of the game, and make it clear that your version is a clear and distinct entity from my own (unique title, title screen, documentation, etc). You can also take anything you want from my game (coding, graphics, styling, whatever) to add to any other project, so long as you credit me. If you want to make new content for inclusion in the game, feel free to do so. If I like it and think it fits with the game, I'll include it. Please note, I made this game while learning Twine and didn't know it's full capabilities from the start, so there's some ways I've coded things that I don't recommend copying.