$ sudo apt-get remove games-shootemup 

Uninstall games-shootemup including dependent package

If you would like to remove games-shootemup and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove games-shootemup 

Use Purging games-shootemup

If you use with purge options to games-shootemup package all the configuration and dependent packages will be removed.

$ sudo apt-get purge games-shootemup 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove games-shootemup 

See Also,