I agree with tymerum, the scaling of the prices are a bit wonky. In late game, the cost of upgrades are kinda reversed... where upgrading oil companies is the cheapest, and upgrading newspaper delivery is the most expensive.
I agree with the difficulty being too low. Never had to use the explosives upgrade, and never got hit during the 40 days... and I'm using a touchpad to play on top of that. I did primarily use the high accuracy weapons though, and then switched one of them out for a grenade launcher towards the end.
It helped me a LOT to drop a bit below the pipe before flapping up through the entrance, because coming through the pipe too high greatly increased my risk of flapping too soon/late due to how quickly the bird's fall accelerates.
After completing the tutorial, it keeps automatically redirecting me to their site whenever I load this page, leaving me unable to play the game on Kongregate.
*Spoiler* The Torture Room is a bit bugged... just had to stay to the right of the screen to prevent being detected by monsters. When I went to see what was going on with the left side, there was a literally a standing wall of monsters that came after me.
After training, it automatically threw me in a match against high-level players who instantly kill me when I try launching my plane. What fun that was...
When I teleported back into the dungeon, I ended up outside of the map (stuck in place inside of a wall) with no way to get back inside the playing field.
When upgrading my axe to high levels, I'd see the attack & health sometimes go into the negatives for the bonus stats, leaving me unable to win fights until I continue to upgrade until both bonus stats in the positives. Also, if I do too much damage, the enemies only take 1 damage (level 132 axe adds ~805,000,000 damage), even to the enemies in the starting area.
It would be nice if the quests took items that are already in your possession... it would fix the quest issue when the game freezes, and also prevent people from doing a quest before they're suppose to.
 "Idle Necromancer"){kind=icon}
 "Jelly Lift"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "The Zombie Show"){kind=icon}
 "Dead Zed 2"){kind=icon}
 "5 Differences"){kind=icon}
 "Flappy Bird Flash"){kind=icon}
 "Loot Hero"){kind=icon}
 "Tanki Online"){kind=icon}
 "Barons Gate"){kind=icon}
 "Min Hero: Tower of Sages"){kind=icon}
 "Operation: Penguins vs. Pelicans"){kind=icon}
 "Forgotten Dungeon 2"){kind=icon}
 "I AM PLAYR"){kind=icon}
 "Battle without End"){kind=icon}
 "Rooms of Memory"){kind=icon}
 "Teddys Excellent Adventure"){kind=icon}
Thanks, fixed :) (now it's 500 to get the achievement)