Hi, I'm working on a v1.3 for this hack as of now.

The biggest addition is improved cursor movement.
The original NES version would stiffly move the cursor at a constant 2px/frame, which would feel twitchy in some situations and really slow in others. In contrast, almost every other version of the game that lacks mouse control has the cursor accelerate the longer the player holds a direction until reaching a top speed. I managed to find some more free space in the ROM and was able to implement a close approximation of the SNES version's d-pad control (the gold standard IMO), just
very slightly jerkier and lacking the "run" button, so to speak. The game feels so much better to play now.
Aside from that, I'm just adding some polish. I've edited the cursor graphics so that they can't blend into the terrain or other lemmings. Do let me know what you think of these new sprites.


The game also now initializes all of system RAM at power-on. Yes, the original NES version didn't do that. More or less, things just happen to work out perfectly in the code that this doesn't matter, but it's still bad practice and has already caused me several problems!
Finally, I plan on adjusting the audio mixing and fixing a very slight bug in the sound driver.