Demo Update: Alpha -> Beta

Update contents:

• Removed hitbox from damaging stalagmites in the starting area(s) (there are some damaging stalagmites, you'll know what to look for
• Added new enemies (Gazer, Black Motes, Wisps)
• Added mini-boss 
• Added illusory walls that conceal bonus rooms + optional collectibles
• Added some new music track(s)
• Changed the way lifetime soul count is depicted
• Added the lead-up to the final area boss

As always, lemme know if you find more bugs