One-Punch Man: The Strongest compressed .PNG files

[unknowni123]

Hey y'all. New here, mostly hang out on The VG Resource but decided to try here too.

I'm working on ripping the artwork and sprites from the mobile game One-Punch Man: The Strongest. I got to the .PNGs but they're all encrypted, so I've hit a roadblock. HxD shows me that they have no .PNG IDs such as "IHDR" or "IDAT", so I assume they're pretty encrypted. Each one says "SSKOSISNIUBILITY" at the top, not sure what it means.
I've tried a couple BMS scripts with quickBMS to no avail. Since the game is made by FingerFun I tried using a BMS script for one of their other games (KOF'98 UM OL) to no avail. Looks like I need to figure out what kind of encryption it is before I start throwing things to see what sticks.

Here's a few examples: https://www.dropbox.com/s/imy674lcnzqcl9s/135.zip?dl=0

Any help would be appreciated. I'm pretty amateur when it comes to decryption, so just a BMS script or a name for the encryption style would suffice.

[zhiqieou]

Did it finally work out?