1. No custom graphics- I know this might sound like a con, but I've seen several people use a custom graphic for some bosses and make them a clone of other bosses, just aesthetically different.
2. Old boss remixes- Old bosses will now be given new love, with new ways to increase their difficulty such as the stage, or npc flags to make them almost entirely different.
3. Originality- A lot of my boss fights are concepts I myself have not seen that often, if not at all. Some will be similar to others but it won't be overrun with similar boss designs.
4. No set order- There is not a certain order to complete the levels in. (with an exception of the final boss) You can go at your own pace and skip bosses if they're too challenging.
5. 3 difficulty modes- Easy mode starts gives you unlimited free power-ups at the start. Normal mode gives you unlimited Mushrooms. Hard mode gives you no power-ups, and has a different final boss at the end.
Screen shots
Update (7/2): I'm using an old computer to get progress back on track. It shouldn't take that long to complete now.