This game annoys me because it feels like with just a little more polish it could be really good. But there are things like achievement being ill-considered (I completed the entire game without getting destroyer 2. Destroyer 6 requires 10 times as many kills), bosses being just plain easy (presumably because they have to be beatable with just fire rate upgrades for Patience), etc.
Boosts as implemented are just a nuisance. -5% to ugprade cost isn't even worth the time it takes to place the boost. And you can't even ignore them because the game keeps giving you quests to buy more of them. I'd honestly recommend either rethinking the mechanic, or just ditching it entirely.