Can confirm. It's like Kerbal Space Program, if KSP was about destruction and mayhem in a medieval setting. Also check out dat trailer if you are not convinced.Steam link.
Once I saw the trailer and a couple gifs I bought it and spent the rest of my night dicking around in it. Something I didn't learn until yesterday though is that wrench button is SUPER IMPORTANT. It basically lets you do advanced shit the description of it is a bit misleading.
Single, don't know that there's any plans for multiplayer. You can save and load machines though so you can share those, hopefully there'll be built-in sending at some point.