1 - Yes they are hollow, due to the way physics works i can't do much about this
2-yeah, not a bug
3 - Physics engine things, it'd be really hard to fix this one.
4 - I haven't noticed, will have to test that one
5 - Yeah, some blocks do make you slower, hopefully i can get that fixed
6 - The game should save the moment you press save, in my opinion
7- I have no idea how to fix this one, neither does anyone else, it seems. Sorry.
8 - That's due to islands falling when they don't have a crate, it's very buggy (also use storage containers to store crates)
9 - Yeah, resources spawn infinitely, might fix this one
10 - You get water from buckets in the dark realm, and the silicon bug will be fixed next update