Thanks, I'm glad you enjoyed it!
I initially thought about using two-digit codes for everything, but I felt like the codes would then be too "close together" and it would be a lot easier to accidentally enter a code you hadn't discovered yet.
In retrospect, it wouldn't have been that hard to use two-digit codes for movement and such while still using three digits otherwise, and that probably would have done a lot to alleviate frustration with the movement. I didn't think of that beforehand, though. Oh well.
Thanks for playing and for your feedback!