I just checked my mail and found this reply to my review from the one that put wiggly paint on the AppStore: "Hi, WigglyPaint is not a web wrapper or a cross-platform hybrid — it is hand-crafted in SwiftUI with Metal-accelerated drawing. That means instant launch, 120 Hz ProMotion scrolling, and the right feel on every Apple device." I got my refund without issues btw.
The price also seems to have gone up almost double the price and the ranking too..