I've been playing this game for a while and, I don't mean to brag, but I've come pretty close to almost killing the first boss like 4 maybe even 5 times. Seriously though, the boss needs to drop coins when you shoot it, or you need to find another way to make getting upgrades easier, because really it seems that the only way someone is going to defeat the boss is through luck.
I'm a 3rd year college student and this game taught me more about how cells work than any class I've ever taken. And that includes Honors Biology. I even love how to credits are a form of review. Everything about this game is absolutely fantastic; each little aspect was carefully planned and beautifully executed. I will be emailing a link to my biology professor! (Platypuses being aliens would explain so much XD )
A function that allows you to hold down the button instead of pressing it to recruit troops would be fantastic. Like how you can autofire arrows by holding down A. Also, the troops appear to have some sort of cooldown. It would be nice to know what the cooldown is in the troops' descriptions, and also have a visual aid on the button to show the cooldown timer.
hahaha Well done! -Tim