trying the one right now (500k lvl 1 weap), i haen't made it yet, but i think once you hit 400k, you should have about enough for the 100k points bonus for 10k cots, theoretically, it's possible, and it'll cut your playing down a lot longer, maybe making it a little easier to get.
to get to diner, get 20 nice entries before 1 min is over, then starslide to neptune. don't go above neptune, or else you won't have enough time for another jump. after neptune, fall down. before your last jump, make sure you waterslide, then just keep starsliding. if you did it right, you should get at least 1700+ m, 2000 for diner.
If you bother to attempt the badge and fight the bosses, it's actually pretty good. if there was no badge, i wouldn't even touch this game. hidden gem.
after playing for 5 min to get to know the game, you realize how to avoid the bad crap, and realize that with a good multiplier you can get the badge in another 5 min. first get lvl 3 blades, then lvl 3 armor, then always ahve the armor on until a seeker is attached you to, then switch, hopefully he's eating a thing that has blades and it'll kill him. afte ryou have max armor and blades, just level up agility, if you're doing it right, you'll have your badge before 10/10 agility. i got mine with 9/10 agility (my badge), then i quit.
to all those who completed it, and having gotten a card yet, it's because kong is experiencing huge server lag. don't worry, you'll get your badge/card. just wait, give it 1 day (at most). you'll get it
i think the easiest way is to get 1 single double machine gun, it was nice speed, upgrade it for incredible constant dmg, and the other towers just make support which are all auto.