Submit your score to earn achievements. Make sure to disable any AdBlocker or your score won't be able to submit to GI servers and you won't earn the achievements.
Survive as long as you can. Hard mode gives a 2x score multiplier.
Score 2,000,0005 GIPS1632 Awarded
Score 10,000,00015 GIPS716 Awarded
Score 20,000,00030 GIPS58 Awarded
Score 60,000,00060 GIPS35 Awarded