Unfortunately, I haven't seen this issue before. What browser are you on?
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I recommend you try restarting your browser. If your device has very low RAM, you can try closing other tabs / applications to free memory.
The game has checkpoints so it will resume on the last puzzle where you left off.
If you can see the main menu, just press enter/return to start the game. If you can't see the menu the game might be broken (Right now it's known to have problems running in incognito mode as well as old iPads).
Unfortunately, I never added touchscreen controls to this game. It can probably still be played in an iPhone / iPad web browser using a Bluetooth keyboard (I agree it's not ideal).
You can check out some of my newer games like FeedVid, Marble Mouse, and Thermomorph - these should work reasonably well in the iPhone / iPad browser.
I've deleted some comments that revealed puzzle solutions so that people won't be accidentally spoiled.
Instead, I added an answer key in the description. You can use it if the in-game hints don't help.
Sorry about that, I really should have added a hint system to the game. I've updated the description on this page with hints, so you can select hints based off of how many videos you currently have unlocked.