I'm sorry but I can't test your game with my agacart...
The Agacart supports 256KB and 512KB .LYX ROM files, 128KB requires convertion to 256KB. Can you convert to 256KB ?
That's what the LNX2LYX converter is for in case you need to convert any other ROMs - https://atarigamer.com/lynx/lnx2lyx