Great game. Cheer me up during a rough day, though I'm curious about the user name.
Hey, I am glad it cheered you up and I hope you're doing better :)
When I was a kid visiting family in Arizona, I ran into a small cactus and didn't notice until I saw my leg bleeding later at home. I kept saying 'I didn't see the cactus!' so my parents started joking I got hit by an invisible cactus. I loved playing as the Cactus in Plants vs Zombies Garden Warfare (miss that game), so I changed my username to Invisible Cactus and it stuck ever since.