I'm quite certain that I'm not just failing to bump into the enemies. There are one-tile-wide passages in the mountains around Icycull where you can be blocked from passing by a wandering monster, and combat will not begin until you hit Z, no matter how much you rub your face into them.
All of the wandering enemies in the Icycull Mountains, as well as the Dread Mountain's Tundra Pixie and Lost Isle's Lamia, fail to initiate combat when bumped into.
I meant to just double-check I wasn't mistaken about that report, but I found a few more things while doing so...
The cabin door on the Icycull Mountains Summit should probably have a black tile behind it instead of continuous wood, which looks pretty weird when you open it.
The pools of water in the Lizardman dungeon on Lost Isle can be jumped over even without pulling the levers to raise the rocks.
Pressing 9 to warp back to the Lab takes you back to the smaller original lab rather than the expanded lab.
Eating Anna, at least at her maximum size, leaves her portrait onscreen.
Feeding Glowing Slime to the Red Slime (before she reaches party size) leaves her portrait onscreen afterward.
The Red and Blue Slimes start out with ridiculously low maximum fullness - my Blue got 2 max, and Red got 0 max.
The prompt to "Add Tiffany to your party as well?" only comes up when both Tiff and Britt are in your party and you attempt to dismiss Tiff. Britt can be dismissed, and either of them added to the party, without the other attempting to tag along.
Jessica's Godlike Meal seems to add 800 fullness, rather than the 500 fullness that its description claims.
Adding a brief explanation of the virus causing daily weight loss to the tutorial book probably wouldn't be a bad idea.
It would be nice to be able to use skills like Digest and Energy Conversion outside of battle.
It would make sense if Tiffany and Brittney could sell you their drinks while hanging out in the lab.
Retracting one point I made previously, apparently I just misremembered what I'd done and hadn't done on my save. Julia's forest quest displays properly in the quest log, and it wasn't too hard to find.