I tried out Demonoire on an iPad running iOS 26.2 and was both surprised and not surprised to find it did look pretty awful with a lot of flickering. Surprised because I didn't know that was happening before, and not surprised because developing for Safari is a total nightmare largely due to Apple's negligence. It looks like the flickering only happens with the new WebGPU renderer that is only supported in Safari 26+ and it's OK with the older WebGL renderer. Given we're waiting on Apple to fix a known flickering bug with WebGPU we just released r466.2 that disables WebGPU in Safari for the time being, so if you try it again on your iPad with the latest Construct update, it should be working a lot better.
As I mentioned, due to Apple's negligence Safari is the most buggy and worst supported major browser, so I would strongly recommend using any other browser on macOS. On iOS unfortunately due to Apple's brazenly anticompetitive browser engine ban, all iOS browsers at the moment are just skins over Safari, so you can't escape it. Hopefully our latest update helps though.
The mobile version of Construct is designed mainly for reviewing and tweaking. It doesn't support all editor features because in many cases it would require a significant redesign or upgrade to properly support touch input, and especially if it's meant to support screens as small as a phone. And as mentioned even if it did support everything, it may well be the case nobody wants to do that kind of heavy development on a mobile device anyway. So for now we're leaving the mobile editor as a sort of lighter editor.
You can however open Settings and change UI mode to 'Desktop', and use the full desktop UI on a mobile device like an iPad. It should work particularly well if you have a keyboard and mouse attached, in which case it should function pretty much the same as a laptop!