How well you can do in survival mode is based purely on how lucky you get with drops. I'd suggest to continue having the enemies drop gold, and pausing the game takes you to the upgrade screen.
Everyone who comments hates thegames8... They must have a lot of accounts to get the rating to 4 stars before all of our 1/5 ratings can overcome it. All their games are the exact same, and all horrible. Listen to the people and improve your games or think about a new career.
So many bugs, between disappearing when i jump, not letting me start levels.... I've refreshed the page several times, and the bugs continue to outweigh the enjoyment of the game. 2/5 until I can play the game without refreshing to fix your problems.
serious bug started around level 11... whenever i jumped i'd disappear off the screen for several seconds before reappearing. Stopped me from finishing the game.
the bug where the robots turn around on the elevators while fast forwarding makes the last level a little tedious, don't get in a rush and speed up the game, you'll just have to replay it.
fun for a little while, but gets old quick. I made it to level 25 having all perfect completions without using any of the cheat codes. There needs to be some challenge to the game.
another game by thegames8, exactly like all their others, that doesn't deserve even a 2 star rating. All of your games suck, and are for the most part the exact same game with different titles. 1/5... only because 0/5 is not an option.