Update: I got the badge with 8 lightnings. It was down to the last move. I thought it was going to be the last level but it's not. FML. Go for the back line and bait the Blight Matrons to the sides and corners.
The last floor of the gauntlet is so bad. I think you need to get 8 lightning bolts and idk how many shields. Buy cheap shields and buy all lightning bolts.
The Steam port works really well. It's a great game so try it free over there. If you have progress and can access the game, you can copy an account key to the Steam version. If it doesn't work on browser and you have saved info, you can message Mercurato on Kong and he will transfer your key. Just send the account info/key from the Steam version.
A feature I want to see in an update: make it so opening card packs is less clunky. Every time you open one and press done or back, it brings you back to the home screen instead of the pack buy screen. SeniorCactus, do you know if it is up to Kong or the game developers (Robotogames et. al.) to push through the update?
Update: It works on SuperNova Launcher now. However I don't think you can log in to a Bloons account and you have to play as a guest. Maybe next update.
 "Incremancer"){kind=icon}
 "5 Step Steve"){kind=icon}
 "Animation Throwdown"){kind=icon}
 "Pawnbarian"){kind=icon}
 "Toodee and Topdee"){kind=icon}
 "War of Omens"){kind=icon}
 "Age of Rivals"){kind=icon}
 "Tesla8"){kind=icon}
 "Pumpking"){kind=icon}
 "Factory idle"){kind=icon}
 "Bloons TD 5"){kind=icon}
 "Elements"){kind=icon}
Yeah, that was my intention, though there are a some of other interpretations out there!