I can agree. Making smaller games is fine for when you are working solo. Since the project isn't too big you hopefully won't get as stressed as you would making a big game by yourself! Although I would say making prototypes for larger game ideas can be good as it allows you to experiment with what you can do as a developer and learn a thing or two. My view on working solo is make a small game if you wish to release it and make a big game/prototype if you wish to experiment for yourself.