Cool mechanics, they're the highlight of the game. Levelling up feels great, and the upgrades from level to level add a lot of depth to the game in a satisfying way.
The minions are a cute mechanic, but the flag feels quite hard to use, often it'd just end up sending them to their miserable deaths in a sea of monsters, good time overall!
The art is also pretty great, I especially enjoy the intro at the start, but the enemies have some cute designs too.