Update v1.0.156

Added animated decorations to cave menu backgrounds - Added section for advanced options - Added "Advanced Jump Down" option - enabling it requires pressing "jump" key in addition to "down" key for jumping down from a platform - Fixed being able to click "watch walkthrough" button in cutscene levels - Fixed situations where backpack would get stuck on ground under flies - Fixed Level 4 possible box stuck spot - Fixed Level 7 two possible box stuck spots - Fixed Level 23 backpack being stuck in an endless loop because of the flies in the left half of the level - Fixed Level 26 two possible box stuck spots - Fixed minor errors in maps' sprites