In my personal opinion, the complexity of your username shouldn’t matter much. I can think of numerous games I like, but struggle to remember the name of their developer studio, even if it’s a simpler one.
If in doubt, you can always change your username later, but if you are new in the game development world, you will find more popularity from making good quality games, than from your username.
Having said that, it’s a good idea for your username and profile icon to be on the unique side, so that you are more recognizable when a user sees you multiple times. I think your current username and profile picture are good enough for a starting step. Once you grow as a game developer you can always re-brand or spend more time/resources on updating your image.
Hope that helps, looking forward to seeing your creations around :)