Much too easy (at least on normal mode!) getting the sniper and sharpshooter perks maxed out will have you taking out most monsters out in one shot with the starter cannon, and just holding down m1 and spamming E to swap weapons will let you shoot them all at a very fast rate, negating the downside to all the slow firing weapons.
I was expecting this game to consist of nothing more than "lolol im riding a sperm!!!" But it has unique surprisingly solid gameplay. Very nice animations and cutscenes too. I would love to see a sequel with more depth, upgrades, maybe a ranged attack(with a cooldown to keep it from being used over your tail), and combos for knocking one enemy into another. 5/5 great game.