There should be. You should get stunned for a second after hitting the fake one.
Thanks for trying it out. Not all incoming projectiles are "real". The sound shows you which object is a threat.
Try removing the save files and start the game again. The save files are located in C:\Users\(Your user name)\AppData\LocalLow\DefaultCompany\ChanceBall.
Try to unzip the file again.
Check if your antivirus didin't delete any files
If you downloaded it from here then it's a false positive(false alarm). You can check on virustotal or you can try using other antivirus programs.
Does this happen on all the gamemodes ? Have you tried to change the keybinds?
The game is free to play. The price is only for donations. There is a button above the price to download without donating.