Thanks for checking it out!
The balancing of the game using this mechanic is not great, admittedly. It requires you to think opposite to what is the norm whereby killing less enemies will give you an easier time, so if you are struggling it may be better to just kill the mobs that are in your way rather than hunting them all down (partly my design choice with symbol encounter rather than random battles).
You can also save in front of chests and reload if they are Mimics. These are fixed and not random chance, so a Mimic chest will always be a Mimic chest.
I wasn't planning on an update for this game but I may consider if people are finding it too tough. Let me know if this is something you want.
Thanks :)