I hope that you didn't make a simple copy/past of the gotek schematic since these devices are quite weak... You should at least add ESD protections on the buttons & display lines, on the USB, and maybe the most important for the security of the Amiga and the user : add a current limiter on the USB power supply and a fuse/polyswitch at the power supply input. Do you know that the gotek shouldn't be sold on the U.S & E.U territory regarding the EMC compatibility and electrical safety ?
. Take also care of the possible EMI/EMC problems with this ribbon. ( This is just some advices
Other subject : Is there a mean to connect an I2C LCD on the board ?