Available Gowin FPGA chips options are kinda boring:
GW1NZ-LV1FN32C6/I5 - I think it's the same as on Tang Nano?
GW1NS-UX2CQN48C5/I4 - the one I made a board for
GW1NS-UX2CQN32C5/I4 - the same, but 32 pins instead of 48
GW1NR-UV9QN88PC6/I5 - expensive, but probably 9K LEs