Great design, ruined by unresponsive weapons.
Graphics: Hand-drawn, apparently original graphics that rival anything in Metal Slug. This is some truly excellent sprite work. I hope your day-job is making sprites for GBA and Cell Phone games, because if not your talent is going to waste.
Style: Sk8torboi battles Metal Slug zombies on Main Street. It's cooler than it sounds, really. Everything is colored, stylized, and animated to sick, lush extremes.
Sound: The music is excellent for a loop as short as it is. The sound effects get a little repetitive, though. Maybe next time go Half-Life style and put in 4 different sound effects for each possible impact?
Violence: Those fat guys really do go pop when they die. Sick stuff. Could have been worse, though.
Interactivity: I had issues with the interactivity. Mostly the problem was, there'd be a zombie in front of me, and I'd decide I want to kill him as players are wont to do, so I'd push the "kill the zombie who's right in front of you" button, and then this long-ass animation would start playing, and then I'd get hit before the animation finished. You see how long and uneccessary that run-on sentance was? That's what the weapon animations are like in this game. Once I got wise to this problem, I started trying to plan my shots strategically. But then, by the time I moved into a position to fire my rocket launcher into a crowd, the powerup would expire and I'd be firing my useless pea-shooter into an unstoppable wall of undead flesh. Based on the reviews for Battlemachy, it seems that Urban Squall's policy when players complain about the controls is to say "The controls are perfect! Buy a $4000 computer!" so I don't know why I bothered saying anything.
Overall: Great characters. Great graphics. Nice sounds. Great levels. Great gameplay paradigm... in theory. Execution falls flat on its face because the weapons fire too slowly, reload too slowly, or wear off when you least expect it. It's sh'mup meets survival horror. I realize that the whole point of survival horror is that your weapons barely do anything to the zombies, but in this case it totally ruins my sh'mup.