Hey Kochab -
I have solved what is causing your mystery sphere. Ok so the blueprint that you are using to function as your base character is pulled from a level which uses multiple mini games which can be started and stopped by clicking on the buttons. It is important to understand that because that blueprint was written with that setup in mind.
The sphere is because your new level has a unique gamemode and default pawn class which is separate from the player controller BP that you migrated over. The sphere is actually created by the new level’s default pawn class and if you watch your scene outliner during play you will see a Default_Pawn## in blue appear. To test this create a new Blueprint based on Game Mode and in the default settings change the Default Pawn class to the BP_Pixel_Player then in world settings change the Game mode to your newly created one. Now when you play a separate Pixel ship will appear instead of the sphere.
What I would recommend in your new level is to separate out the various blueprint components in the BP_Pixel_Ship_Game_Controller and setup the new gamemode with the BP_Pixel_Ship_Player as your default pawn class. This will require a bit of blueprint work to rearrange the various components using a default pawn class and ensure everything is communicating well again, but it will solve the problem with the mystery sphere.
If you need me to expand please feel free to respond -
Eric Ketchum