Only thing starbound has on otherworld is starbound has different race where I think terraria is just hoomans
That said, at the moment, different races in starbound just means a different look to your ship/armour/weapons.
Or if you're a novakid you make guns.
There's currently nothing that makes playing as an Apex different from playing as a Hylotl.
So really, they might as well all just be humans for the difference it makes.