The Raffle Machine play online

The Raffle Machine is an application for making your draws.

Indicate the number of prizes to draw and the maximum number of prizes per participant.
Create the participants list and save it or if you already have one list, open it from the app interface
After a brief calculation you'll get the winner or winners

Your opinion is the most important, so I'd love you to tell me what things would you add or delete from the app.