Ive quickly slapped togetether an update to fix some issues, here is the changelog:

Fixed Stalagmike's audio
Changed Walter's chase radius
Walter now tracks directly to a gem when mined from any distance
Walter now randomly spawns and can teleport when not being viewed
Stalagmike and Sir Tadpole fixed teleportation when not being viewed
Fixed a few navigation issues
Fixed flipped normals on day 3
Fixed floating stalagmites
Fixed Sir Tadpole on main menu to stay locked to screen
Main title now in title case

TLDR; I fixed some navigation issues, and issues regarding the enemies AI.

In the next update I hope to tackle some more things such as:

Fix 'Continue' button
Fix navigation for Stalagmike and Walter
Settings menu
Enemies agro when breaking final gem
Better win screen