I was able to escape with the whistle, thankfully. Equally thankfully is that with this bug/exploit, you don't really gain much, because if you do it as soon as possible, you don't really have the tools to attain too much from it, think one of the rupees in Crash Basement I was able to access, and Arena 4, but without the right weapon, one of the rooms is impossible to pass. I'm not even sure why I tried the F6 item in that specific location: gamer's hunch, I guess. You COULD use it to skip the 501 rupee requirement to get in, though.
Edit: Also lets you get a heart piece early, as well as accessing Arena 3, but nothing too huge so far. Never hurts to explore the full extent of a issue this big!
Edit 2: Going deeper into it, I've managed to reach the Level 5 entrance far sooner than intended, but I believe this exploration has ultimately soft locked the save as I cannot find a key to progress deeper into Mike's Garden. I've already gotten the key from defeating Flowey and going though that small room, as well as the one from the plant monster, so I must have used one of those keys somewhere I wasn't supposed to. I managed to not notice the lock bushes during my initial pass through the area. Willing to provide my save to double-check I truly haven't missed something along the way, though, but this softlock is on me for exploring where I shouldn't, lol...
Edited by Amatsu, 24 October 2019 - 03:40 PM.