Ran into a problem on level ten where my orbs initialized at -126. Despite killing all the bugs and getting at least to a positive number of orbs, I still didn't have the 20 required to complete the level. After reloading the page, the level initialized at -26.
Although the visuals are great, the action feels clunky. I bet the developers tested this for bugs, but not playability. Also, the hard sell on tokens is annoying.
I'm a software developer and I like getting paid for my work. However, the almost-aggressive sell tactics in this game are obnoxious at best and offensive at worst.