City Connection, Mach Rider and Elite were all unplayable because of significant graphic corruption.
Battle Toads and Rad Racer were playable, but had issues (A really strange flickering with BT,and slight graphic corruption in RR)
I don't know if it's just the roms i've used or the EU Nintendo mini, though Mach Rider not working might explain the relatively small default rom selection.
Elite is for PAL NES only and will not work on NTSC emulator. Same with PAL version of Battletoads.
But NTSC version of Battletoads crashes on second level because of uncorrect timing emulation. Actually NES Mini's emulator sucks. Only few mappers, bad sound, uncorrect timings, no PAL emulation. It's tested only on default 30 games.
Autor hakchi2 piszę ciekawe rzeczy.