Thanks for the detailed feedback :)
In terms of the gameplay, I agree with you that it could be more interesting - we did have some more ideas, but it was the first time for me (/us) to develop a game that only uses audio feedback, so quite some time went into figuring out how to make the gameplay work, especially not getting lost.
For me, gamepad controls are mixed up on the web (using a PS Dualsense, in Firefox), in my case LB / RB as well as Square<->Cross. I think the issue has to do with Godot's Web export, I guess it would be too much effort for me to fix these. Thank you for testing this, though!