For example, you were banned by system. After you went trought the wave, the game saves (If you will be un-banned, you will start from this wave) and Cutscene appeared: Police officer conduct you to “The Galactic Prison” or “Auto impound”. There will be a red flying counter near prison/impound which shows you “time left”. Ban counter will be shown in your stats or medals (Medal for ban, ok).
I will add a video how it will look like, thank you.
UPD: Sorry, there are some problems with wacom, damned drivers 0-0
UPD2: My fortuna is very bad. USB has been broken. Sorry…
UPD3: YEAH DUDES! I found a cable to connect my tablet! But my stylus has been broken… But I fixed it!