I can only say that this game is decent. Everything it wants to do, does it fine enough. If you have a GBA, this game is fine enough

1. The graphics are pretty decent for the GBA. The Kaiju look good enough despite some odd coloring choices, Godzilla being fluorescent green, purple Mothra, blue-green Megalon, etc
2. The gameplay is simple and it works. You have the following buttons, jump, high attack, low attack and block; you can combine block and jump with other buttons to make special moves or hold attack and jump
3. All Kaiju are distinct from one another. They fight different and don’t share moves
4. The music is well made, it is not that memorable but they fit with the tone of the game
5. The enemy AI is very easy to deal with. The only issue is that they tend to gang up on the player and not on themselves
6. The final boss is just a giant enemy. It is a bit hard to defeat because it has crazy range with its grabs