Oh, wow. This looks really interesting. I love the design of this handheld and how it folds out into a mini arcade cabinet.
I found some more info on it here: https://info.sonicretro.org/Sonic_Adventure_(LCD_game)
Apparently there were 5 games released in the Tiger "Arcade Table Top" series, all ports of games from Sega's Dreamcast home console.
Thanks for the suggestion!