I really liked the concept of being an alien tasked with destroying earth, super unique take on the theme!
As others have pointed out, I wished there was some form of visual feedback that my disasters were doing anything. I wasn't sure I was playing the game correctly until I noticed the progress bar at the top filling up. I think it could feel very satisfying to see cities blown apart.
I also found the gameplay rather slow paced. There were new events, but it wasn't clear how they affected my overall strategy of click on a random city once my spin refreshed. Some more visual feedback would help a lot here too!
Overall this is a solid start! I love Plague Inc. so I think this has the potential to be very addicting :)