Honestly the only issue i have with this game is the fact that every time i reload my page or close out of the game, the game itself resets. With that in mind the idea of this being an "Idle game" doesn't really fit the bill as with an idle game i'm expecting to be able to close my webpages, come back to the game in a few days, and have gotten thousands or hundreds of thousands of (currency of your choice) and experience points while not accomplishing anything noteworthy in the game so as not to take away from the experience but now having the means to unlock those noteworthy things in game (in this case new levels for each of the girls and new jobs/hobbies) overall this is a great game and i look forward to each new update.
Health Regeneration is also your friend. get enough of it and almost anything you kill won't hurt you in the first place ^_^ that is up to the 60th floor at least.
if i were you i'd add a few more in game achievements, perhaps some achievements to save a certain amount of money or even purchase all 58 upgrades, good game nonetheless, 4/5, some things were a bit wonky but as soon as you earn maxed grain maxed helmet maxed and engine close to maxed all you have to do is avoid the birds till the 3rd marker or so while having your engine on, not even using energy then activate your helmet once you get to the 3rd marker and you should be able to blast right through everything
thumbs up if you found all the endings then managed to buy a full inventory of claymores and a full inventory of mithryl armor while having the land ship and all 5 members of your crew having claymores and mythril armor on while still managing to have 150 diamonds and over 1mill gold
play the first song in this playlist while playing this game and if you manage to get through the whole song while still playing then continue to listen to the list after that thank me for allowing you to survive longer XD music is always better while killing zombified flesh addicts right?
MORE BOOM-STICK FUN!!! did i take a wrong turn at hell and end up in heaven wait no these bastard zombies are still here all well guess i'll have to kill some more!!!
sometimes letting a few balloons slip though in the first few rounds can be better for you in the future you might be glad you didn't buy that upgrade after all :)
so far i have only found one problem with this game when you fire the last bullet out of a gun and immediately afterwords pick up another weapon the weapon you picked up will disappear and you will not be able to use if you could fix this it would be awesome