Interesting idea and I like the 1-bit palette! Quite difficult to play though!
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It used to be easier, but I buffed the enemy spawn rate last minute to make it a little more interesting(you'd spend much of the start of the game just waiting for enemies to spawn/kiting a single enemy if you were to shoot them straight away, which didn't seem very engaging).
I think in retrospect, I should have chosen a spawnrate somewhere inbetween, and made the spawn rate ramp up slower.
Glad you liked it though!