Good game, very polished and fun.
I tried to survive as much as I could. I suicided at day 185 after three and a half hours playing, after which I conclude it is impossible to lose if you want. The enemy never gets stronger, so they just appear in higher amounts over time, and more enemies means more power-ups dropping which can heal you completely and wipe out half of the enemies, and in later days you have basically infinite rage, which obliterates everything with the most powerful cannon. The lag is immense on later days, but is manageable, the physics seem to never break and even if you cannot aim properly, you will be hitting something most of the time.