This is a solid game jam submission. Good loop and although simple, it is complete and engaging. You mentioned the mouse sensitivity settings... 100% agree that needs tuning (in the potion book scroll too).
I really wanted a sound effect for going up and down the ladder too... those little additions and polish would really lift it.
Understanding the right potion for the need was an interesting take too thinking about it. Again simple - but good nonetheless. I think having a bit of urgency would work too... I seem to remember a wee pizza making game where the faster you delivered the order the more tip you got and if you left it too long then the customer would get frustrated and walk off. Adding that sort of negative 'failed' state and the underlying tension would actually increase the fun quite a bit.
There is a lot going on in this though and you mentioned that virtually everything was built from scratch... so seriously well done team! Keep up the good work.