Special Effects:

Clearly define the special effects introduced by the mod. Whether it's changes in environmental conditions, unique challenges, or new mechanics, make sure they enhance the overall experience without compromising the core enjoyment of the game.
Balance:

Strive for balance in the mod. The addition of nuclear weapons and related features should not make the game too easy or too difficult. Consider the rarity of nuclear weapons and the challenges players must overcome to obtain and use them.
Purpose and Storyline:

Develop a purpose or storyline for players in the nuclear bunker survival scenario. This can add depth to the gameplay and give players a sense of direction or motivation.
Gameplay Modes:

Consider implementing different gameplay modes to cater to different playstyles. For example, a challenging survival mode and a creative mode for players who want to focus on building.
Nuclear Tech and Crafting:

Clearly explain how players can acquire and use nuclear technology through crafting. Ensure that the crafting recipes are intuitive and provide players with a sense of progression.
Multiplayer Interaction:

If possible, incorporate features that allow players to interact with each other in multiplayer mode. This could involve collaborative efforts to build nuclear bunkers or competitive aspects related to nuclear weapons.
Endless Apocalypse Mode:

Expand on the endless apocalypse mode, providing players with a variety of challenges and scenarios. Consider random events or periodic challenges to keep the gameplay fresh.
Free Exploration:

Emphasize free exploration by creating an expansive and interesting world for players to navigate. Encourage players to build their nuclear bunkers in creative and strategic locations.
Controls and User Interface:

Ensure that controls are simple and intuitive for players on mobile devices. Create a user-friendly interface that provides information on the status of nuclear weapons, resources, and survival elements.
Documentation:

Provide clear documentation or in-game tutorials explaining the features and mechanics introduced by the mod. This helps players understand how to play and make the most of the new additions.
Feedback and Updates:

Actively seek feedback from players to identify areas for improvement or refinement. Regularly update the mod based on community feedback and to ensure compatibility with the latest Minecraft versions.
Integration with Other Mods:

Consider making your mod compatible with other popular mods, as this can enhance the overall experience for players who enjoy using multiple mods.

Disclaimer:-
This is not an official Minecraft product. It is not approved by or associated with Mojang.