Sky

You can only have 5 saves available in-game at a time, but you can store away saves in your computer and switch them out when you want to play whenever you want, you just gotta learn a bit about your computer:
 
^^especially check out the video linked in a comment, its very old but still accurate!

The devs have sadly said that multiplayer would be very hard and very, very unlikely to ever happen.

Philo said that spots are randomly placed, so I guess for Identical Twins with spots, the spots should always just be randomly placed and then copy and pasted to the other sibling

This isn't a bug, it's supposed to do that. There is a feature request to make it so it stays, but I'm too lazy to go find it right now 😅

Actually, I'm pretty sure you can invite them in on Sandbox. You just need to travel from a different island (like starting on Crossing) then go to Home Island with the immunity. It should work then

If the creature has Toxic Body (and maybe some other genes, I don't remember), the leech just falls off as soon as it attaches.

It probably switched because the gene that was supposed to be recessive is dominant over the trait that was supposed to be dominant, so when it generated the animal it fixed the dominance to the way it should be (the way it is normally). Thus, this is not a bug, unless the gene that switched to dominant isn't supposed to be dominant. What genes were they?

The bubbles normally indicate the days of each lifespan. In Sandbox (I haven't tried Story Mode in this new update yet, though), the bubbles were removed because players can now change the amount of days in each lifespan

Welcome to the forums! Could you attach the crash report? You can find how to here if you don't know how already.

Welcome to the forums! I like your name
Sometimes the achievements take a while. The best thing is to just make sure you're connected to the internet and keep playing. Sometimes the achievemnts take a long time to pop up. It took me a long time to get the Adam's Curse achievement, both because my babies were never taken and also because when they were, the achievement never came. It finally did, though.

I'm pretty sure it's supposed to look like that. The previous texture looked too much like a Jungle port. This one doesn't look like any of the other ports, so I assume that it's supposed to look like this. Besides, it looks  like it would go to a Whale Island.

It's not that they're teleporting; It's just that they moved out of your sight/hearing/smelling range.