normal, it's from a new Humble Bundle

Probably from today's bundle: https://www.humblebundle.com/games/spaced-out

yes, indeed strange :)

They are technically different apps not just in name. This version has the original graphics and some other stuff as well as separate DLCs (included in the Expansion Pass). This version also has another separate DLC with which you could upgrade it to the Spacer's Choice version thus being able to switch between the old and new version. The Spacer's Choice Edition app doesn't include the option to use the old graphics and stuff.

sure, have fun with it!