I didn't expect to ever have a compilation ROM up, but Jimmy52905 was kind enough to make an easy level importing/exporting tool. I was able to throw this together in a couple hours. It includes:
-About 20ish levels (check the "Overall Progress" thread - any level that is marked with a green color is in this base ROM).
-Three new music tracks. More will be added of course, and some of the levels currently in the ROM will need to have their music altered (e.g. 6-1, assuming we get a snow theme).
-LevelASM (via SPASM, thanks Raidenthequick, Lexie, leod, and anyone else who helped on this).
What this DOESN'T include as of yet.
-Custom palettes. Some of the levels may look a little odd due to this (e.g. 1-6).
-The majority of the level icons.
Without further ado, here's the current base ROM for this project:
Let me know if any levels act weird/broken/etc.