I love it, the mechanics are so fun, and also the main menu is unique! The camera is a little glitchy :)
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I tried the same thing while ago and I found this temporary solution if you want to code by yourself:
https://wiki.unity3d.com/index.php/MouseOrbitImproved
Or for a quicker result and to not invent again the cold water I used this super cool free asset:
https://assetstore.unity.com/packages/3d/characters/eazy-camera-102275
Hope this help :)