Board Thread:Questions and Answers/@comment-7341673-20160720053548/@comment-27701762-20160720054302

If I recall correctly, it is possible to die. You pretty have to actively dodge the health power-ups.

In which case, it should act just like the other post-intermission parts, where you reload the game and get sent to the same part where you died.

But it's been a while since I died during the Photoshop Flowey battle, so I'd need to replay it to be absolutely certain.