ok, let's go over some not so obvious game mechanics.
Upgrading your gunmen doesn't work like most games. going from 1 to 2 shooters doesn't double the amount of shots fired. The game works with a timer, every x seconds a shot is fired if possible. every time you buy another gunman, it decreases this time a little bit. This has the effect of making the first 15 or so upgrades nearly identical to 1st upgrade. Around 20 or so, the upgrades hit a "critical" point and your gunmen become awesome. Upgrades continue to be awesome up to roughly 50 (i might be off). Alot of the other upgrades work with a similar mechanism, so try different things out.
y is everyone complaining about the hard badge... way easier than most games. just use ur double click every time a large wave spawns. if its not ready yet, lean on ur bullet-time. i also like to strafe against the left or right wall most of the time.
imo, the orange lvl was harder than 150000
if you're like me and went through levels 40 - 99 in one quest, don't worry about the boss. it's not worth going back just before the fight. just make sure to buy 2 hp pots at the lvl 99 shop. the boss hit me for about 60 - 80 damage a hit with no suprises. his hp was 2800 (i think). If you're full hp and have some decent items, your fine.
Some general tips:
-the best defense is a good offence, usually.
-always try to have just enough agility to get the first hit.
-intelligence is mostly useless (only heal is very useful)
if you're wondering why there's a 'random' element to this game (leaving the mouse in the same place doesn't get the same shot), it's the waves. if you shoot while ur boat is always at it's highest point or at it's lowest point, ur shot will always go to the same place.