I opened it and stopped on the first screen, which is itself an answer to your beginner-friendly question: the game opens straight onto a Username / Passcode form, with no guest option and no line saying what I'd be signing up for. I wasn't going to make an account to look at a prototype, so I can't tell you how the drawing board feels.

Two things I could check, though.

The embed is 600x800 with the fullscreen button turned off. On a 1366x768 laptop that leaves 305px of your game below the fold — the "Enter Sticktok" button included — with no way out into fullscreen. Ticking "Fullscreen button" in the embed options, or bringing the height down nearer 600, fixes it in one click.

One of your tags is a typo: simluator. itch.io/games/tag-simluator has two games standing on it. Tags are shelves, and that one is empty.

Good hook, for what it's worth — a feed you have to draw yourself is a premise I'd click.