It feels a bit like you are expecting completely inexperienced users, but the site doesn't quite anticipate their needs. Loading on mobile was not legible (which is fine, it's an early version.) Switching to the desktop version, the instruction for the initial design to "set" a bit is unclear. What is the function you want the user to implement? It's underspecified.
Further, there needs to be an explanation of what a testbench is, before you present a "Run" button, as well as an explanation as to what stimui the TB will present, and even the entire idea of Verilog simulation. It would be good to have an opportunity to see the testbench code and what the site expects the correct output to be; I didn't see an option for that. New users may not understand waveforms at all without an explanation.
The AI component is fine, but it feels a bit like all of the educational aspect has been delegated to the user to ask questions of the AI. A user who is inexperienced would not even know to use the word "testbench" is to frame their questions. I would suggest some careful thought as to who exactly your target audience is, and specifying early on what prior knowledge you expect them to have.