It's not. Antivirus sometimes raises a warning, but as long as you've downloaded from the official page at https://fishlicka.itch.io/juice-galaxy, I guarantee I did not program a virus.
Hmm, how did you install it? Maybe its a permissions issue or something weird with your computer. If the game crashed, it's possible that some of the files were "still in use" by the process, in which case you could restart the computer and try to delete it again.
