I can't get past the level because of it so that's great to hear.
The chests being unreachable problem I mentioned is caused by knockback I think. The light aura for example, combined with the relic with 500% knockback, really knocks everything back so far. And I've seen defeated enemies/chests continue sliding into unwalkable tiles.
So the real problem might be that defeated enemies/chests can slide into unreachable areas and come to rest there, instead of continuing to slide until they're somewhere that can be walked on. Or if they were to bounce off of unwalkable areas instead of sliding into them that could work too.