A couple of things here:
First is the most recent release edition. The Mad Knight has no images. I haven't checked if the other new enemy in the forest zone has images or not, but at present there are no images, gifs, animations, or anything for fighting the Mad Knight.
Second is more of a personal criticism. I completely get wanting to get paid for the work you do. It's a lot of work and you definitely have one of the more unique set ups I've seen in an HTML game. You should get paid for that. But locking tiers behind a $50+ pay wall is a bit much. I could see the top tier being $15 or even $20 for some cool stuff. But that price point is cost prohibitive to anyone wanting to try to support the game. Yes there are lower tiers but the meat and potatoes doesn't really start hitting until your $20 tier when you get tier 2 cheats. Expecting people to pay anything more than $20 per month doesn't make much sense, regardless of game quality. I won't harp on the "stolen" content because honestly that's par for the course with a lot of these games. We all shamelessly pilfer the internet for clips and gifs and stuff that will suit our game's needs. But even if this was all 100% original content it wouldn't be worth the upper price points. No game like this is.
I'm not kicking you while you're down. You've got a great game going and I've enjoyed seeing it develop over time. But a more reasonable price point for the tiers that have content locked away behind them is something I would seriously recommend.
End of the day though, it's your game. Do with it what you will. If you think it's worth $50+ per month, then go for it. But go for it knowing the community is likely to not agree with you on that and will likely choose not to invest at all on principle.
Cheers, mi amigo!