Yes I tried clicking on it to focus it multiple times but it didn't help. Maybe it's just a quirk with Firefox. And that's neat that it's upside down. I didn't notice that. You're welcome about feedback, I saw your request for play testing on Discord and wanted to help you out.
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Cool concept and the music is nice. I tried your game in Firefox. First thing I noticed was that space bar seems to move the page down. I figured out that up arrow key also works for jump but someone just reading the game might not figure that out as only spacebar is listed for jump. Also if I selected show only this frame or put the game in fullscreen mode, then everything was fine. I also tried your game with the gamepad. For me it was very sensitive. You might consider increasing the deadzone a little bit.
Also I'm not sure if this intentional or not but on the screen that says, "HOME" NOW FELT A LITTLE DIFFERENT, HOME is spelled as HOWE. Maybe that was intentional but in case it wasn't I'm just pointing it out.