You can start from exploring source code:
Also please let me ask one question:
I'm understood you dislike for ads (no one include myself like).
But:
Is any bit of ads in app (as in Remixed there ads appear only on reduced difficulty modes) is just as bad as having app flooded with them? ( because one cant have just a little AIDS )
In my mod I am attempting to do modifications in all areas of Pixel Dungeon, and keep a single clean commit for each change. You could try looking at my changes to get a feel for the code. Once I finish with a few tweaks I am going to update with the newest versions (reddit interface changes, version number click brings up version history, difficulty levels (in ~5 parts)).
The code will let you see what needs to be done to do atomic-level things, like adding a new mob to the dungeon, implementing a new weapon enchantment, changing the dungeon size, adding a custom window or scene, modifying how hunger affects the game, adding a level-up buff, adding a new room or feature, etc... I am actually hoping that my code packages will be a good contribution to the community.
https://github.com/FthrNature/unleashed-pixel-dungeon
David
Ah, is this your source? It helps to include a link to it when you first release the mod, or in the Play Store description, otherwise people will think you haven't open sourced it. As for the modding guidelines, it appears your mod has only covered two of the three requirements. You still need to change the hero screen (third requirement).
Once you release your mod publicly to the community, we will add your mod to the sidebar under the Pixel Dungeon Mods section. Please make the necessary changes, and then feel free to make a new post.