Bitbrain
Lost in Dark Sun
I can understand some of these - the ones that involve making the environment more challenging from a lighting, supplies and resting perspective. Heat Metal, I suppose based on common complaints. But the others are a bit mystifying. Why are these spells not allowed in your games? In my opinion you should be very careful in limiting options for players. They come to your game wanting to play D&D and the more you restrict the less it's actually D&D.
Feeblemind -- So far as I am aware, this is the only spell in the PHB that if you fail the save, reduces one of your ability scores to 1 (-5 modifier). I do not like that, so the spell is out.
Mordenkainen's Faithful Hound -- I can honestly say that I don't know why I banned this spell. Will retcon.
Wall of Force -- Immune to dispel magic. I can accept a 7th level force cage possessing this immunity, I cannot do so with a 5th level spell.
Otto's Irresistable Dance -- again, can't think of why I banned it. Will also retcon.