There are goals and rewards for killing different amounts of lifeforms. How many did you get to?
Viewing post in Sacrificial Lifeforms jam comments
I got to what must have been wave 3? Then the earth got too hot, I thought the game's pacing was a bit slow in areas maybe you could have improved that: I personally didn't see much other than a few guys pop up and disappear around the earth: honestly, I had limited time to play your game if I didn't experience that it's likely I lost interest due to how long it took.