According to the developer Spotkin, "Contraption Maker is in a releasable 'Alpha Version' state, which means it is playable, but not yet finished. The current version is missing features, has plenty of bugs and still requires polish. However, if you do buy into the Early Access, you will be helping the original team that created The Incredible Machine make a new game that will be so much more than the original. Our Alpha is already fun, and now we want to get your feedback to make it even better."
The studio released a special video announcing its Steam Early Access release - check it out in the video below.