I'm genuinely sorry but as an artist I wouldn't be making this claim if I wasn't certain. 
The coins are melting together in a way that would be extremely difficult to render accidentally. People who scam using ai images can be very convincing at faking the process- especially if you're not sure what to look for. AI image detectors are often faulty.
Regardless I really enjoy the mechanics that you've put in though! Especially the roulette for the skill tree upgrades is really fun