How does the pacing of the game feel, is it too fast or too slow?
It is too fast.
In what ways might we be able to improve the challenge and the 'hectic-ness' of the game beyond the difficulty of the modules and timing?
When just started playing, I did not know what is needed to be fixed, so maybe be more specific about that. When an object is fixed, make some changes in the appearance of the object. Also, be more specific about how much time each object must be fixed.
Are the existing modules engaging enough?
yes
Would you like to see Ernie have abilities/upgrades and if so what would you like to see?
Maybe add a mechanic where Ernie can fix the objects faster (if you are planning to specify how much time each object take to be repaired)
Game breaking glitches/bugs?
I can still run through walls
General QoL improvements
Slow the character down a bit.