It would have been awesome if it was like an adventure type of game instead of duel, regardless it is a decent game :3

A nice spin on the match/luck game. I think some of the descriptions could be written more clearly, like Mythril's reading that it lowers the armor gauge and not the actual armor. I also think the trophies might be glitched, as I've beaten opponents in 4 rounds and still didn't get the appropriate trophy for it.

pretty cool I would of liked some kinda story either way id still prefer playing this then bejeweled

Muzzle is very bad. He has an entire attack dedicated to doing nothing, and those yellow blocks seem to have a habit of being everywhere when I really need to beat someone down.

A good game, but not as well balanced as I would like!

Pros:
•Fitting music
•Good concept basing it on luck and a sort of bejeweled-esque gameplay
•Ability to win trophies ups the replay value of the game

Cons:
•Unbalanced characters - characters like Misty are on the extreme end of offense, while others are somewhere in the middle or leaning more towards defense, which makes it harder to win against characters such as Misty when you've chosen a more defensive character to duel with
•Percentages of the skill do not have accurate probability rates - I even failed activating a skill that was at 100 % once. Which is mathematically incorrect. This suggests the game has its own way of randomising probabilities for each skill, which is incredibly unnecessary and misleading.
•Does not have a story mode, which makes the game a bit boring in the long run. Catch phrases or at least a dialogue between duelling characters could be used effectively to give the characters more life. An improvement to this, without adding a story mode, could be creating more characters to unlock, beyond Tokimac. This would increase the game's replay value and make for an arguably better length to the game, given the game as it is now doesn't have a lot of concepts/features going on.
•The weird creature (could it be Death itself?) pronouncing the names of the characters when you choose them or when you win or lose a battle is a bit weird... For example, when pronouncing "Keitaro", it is hard to understand that that is what is being said. It's not detrimental to the game, granted, but it is a matter of adding refinement and a bit more thought to it all.
•This is not really a con, but it would be nice if the trophies/achievements being won in the game could also be won as newgrounds game medals. Just a thought.

All in all, it's actually a really good game. I find myself coming back to play it a lot of the time. I would have given it a lower rating had it not been for the incredible amount of potential the game so obviously has. I'm not quite sure if this game is gonna be updated that much (it doesn't seem like it), but at least consider these things for the sequel I heard you were planning on making. :)