Reached a dead end trying to rip Magikarp Jump sprites.

[EndlessTetris]

that's from an engine that wasn't reverse engeneered, from looking at it it looks like an unity game
if you don't know how to disassemble apks and some asm/programming knowledge you're out of luck

I took a look and while it does look like a Unity game, it's not with the traditional .assets files. There's definitely some compression going on, but all I can really say is that the files seem to have consistent headers. Beyond that I'm afraid I can't help :\

I was worried it was going to be harder than entry level sprite ripping. I have no programming skills, alas. Thank you, though.