It's difficult to compare the weapons without buying and upgrading them. The plasma bomb and homing missiles have a very simliar DPS at level 25, but the plasma bombs are ridiculously more effective because of splash damage. Likewise, the gauss gun is crazy effective for the price because it pierces, so every shot goes through multiple enemies. It would be great if there were stats for splash damage/piercing effectiveness on the weapon screen. (DPS would make you think that the meteor gatling is the best weapon, but it's nothing compared to the plasma bomb.)
Dual M9s and a basic dog will work for lower levels. Repellent is a deal at 20 kills - you can up your kills by staying near the gun shop and using repellent. Skip the shotgun (awful range); AK47 and dual AK47 will last until you can afford the minigun. Nades and meat are pricey and less useful than the repellent, but dogs are great. Shoot cars to get sweet chainsaws that send zombie gibs flying. (Note: you're invincible with a saw!) You can kite enemies, especially with the speed boost, but zombie cats are wily.
Upgrade path that works well: Dual M9s>basic dog>AK47>dual AK47>big dog>minigun>heavy armor.
Still, once you've upgraded, there's nothing else to do. Levels start to take a ridiculous amount of time, the enemies are the same, and, well, a gib is a gib and it gets old. Bosses? New weapons? Dual machorambo minis (well put, Firelake)? Different arenas? Backstory, missions, etc? Overall, this is a promising game that could be great with more enemies, upgrades, and goals.
So, great game, fun graphics & style, and a nice little story to go along with the rapacious sushi-eating (ol' Sushi Cat is lucky that all problems can be solved with girth).
Just one question: is his wife even alive? She seems so limp!
The walkthrough section for Mardek 3 Water Temple isn't right - there are several steps missing prior to the flipping the Moonstone switch. (There may be others, but that's as far as I've gotten so far.) Following the steps in the walkthrough, you end up in the southeast room with neither the sapphire nor emerald platforms up.