Maybe it was developed by a small group of people who split off from Gamtec? That'd explain the "XXXXXX Ltd", they might have started it at Gamtec and removed the name after they left.
There's another game with something similar going on, Link Dragon, credited to Songtly & Jumbo Team - it's also kind of buggy and low quality, one of the levels is shaped like Gamtec's Chinese name but two others spell out "OIC" and "TEC". I always thought it'd make more sense for the "OIC" level to say "GAM", maybe it originally did but it was changed? I can't tell what sound engine it uses because the sound doesn't work in emulators (I'm assuming it *has* sound here because Hanmin Liao is credited with it, but you never know), but another Jumbo Team game, Ghost Hunter, uses the Shikinjoh one.
But strangely the credits in Link Dragon, apart from Liao, are mostly people who worked on AV Artisan/Realtec's games (and I'm still no closer to figuring out how those companies fit into all this, lol) and the credits in Ghost Hunter are completely different.