This game is epic. Add a free drive mode to it and a secret track or two to make it even better. Make the secret track(s) unlockable by driving off course into a hidden road if you ever decide to use my idea.
-Ketchupyoshi
Weird, I got sandbox mode on my first time reaching wave 400 in Normal mode. I looked at the messages and one of them said that I unlocked it. Maybe you have to read the message to activate it?
I recommend a score/combo counter in free play. It could show the score for the previous combo until you finish a new one. Also, this game can't even have a badge at all until it has APIs.
Why have a badge for this when you could wait for Idle 2 to come out? And yes, it is being made. Nabb sent me a preview of it. I forgot where it was located, so don't ask me where it is.