Seems to be a partial copy of Lords of Idle, lots of similarities tipped me off, but the one that amused me the most was they took the exact shopkeeper sprite/animation and potion structure and used it here. Sure you could try to explain its a free sprite kit or something but not when you copy the same systems and put the sprites in the same places.

While taking inspiration from another project is fine. In this case the mechanics and systems are so identical, my gut says this developer used AI to plagiarize/copy another idle game entirely.