Omega Flowey Fight Simulator Better
This is the single most common complaint. In many fan-made versions, the difficulty is dramatically spiked compared to the original, yet the save system is either nonexistent or extremely unforgiving. One Google Play reviewer bluntly states, "they went too far with the difficulty. In the original version there is much more space... and you can also die in the soul part, and there are also no checkpoints". Another player echoes this, noting that a simulator "doesn't leave a checkpoint at where you last freed a soul".