Wohooo! I manage to shrink my .bin file by getting rid of some of the lvgl features that I predict I am not going to use (Disable them in lv_conf.h). Seems to be working now… let’s see.
My program also works fine just as I was using the normal micropython version.
Now let’s test https://github.com/tve/mqboard !
Thank you very much for the help provided. On to the next problems 
It’s not a big deal to change the partitions size. I’ve already done it for lv_micropython, see https://github.com/lvgl/lv_micropython/commit/218e4311bba4f2cd2df61b53febb08b4ade48c04
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Thank you! In case I need I’ll know where to look