This license grants users a number of freedoms:
The only restriction to that third freedom is that you need to distribute the copyright notice and license statement of Godot Engine whenever you redistribute it. So your derivative product may have a different license, but should still state in its documentation that it derives from the MIT licensed Godot Engine (see below).
Godot Engine's license terms and copyright do not apply to the content you create with it; you are free to license your games how you see best fit, and will be their sole copyright owner(s).
Note however that the Godot Engine binary that you would distribute with your game is a copy of the "Software" as defined in the license, and you are therefore required to include the copyright notice and license statement somewhere in your documentation.
The Godot Engine developers consider that a link to this page (godotengine.org/license) in your game documentation or credits would be an acceptable way to satisfy the license terms.
Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. Copyright (c) 2014-2017 Godot Engine contributors. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -- Godot Engine <https://godotengine.org>
Godot Engine uses several third-party libraries and code snippets, which are distributed under their own license and copyright statements. All such components are compatible with the terms of Godot Engine's MIT license. You can refer to this list for a comprehensive overview of all third-party components used in Godot Engine and their respective licenses.
The above explanations of Godot Engine's license terms and their implications for its users do not constitute legal advice. They reflect the Godot Engine team's understanding of their own license terms and that of their third-party components; in case of doubt, please refer to your lawyer.