Arrow keys to move, space to shoot. Destroy the enemy cats and defeat the forest essence boss! The number of powerups needed to upgrade is modeled in the equation f(x) = 2*3ˣ⁻¹, where x is the current weapon level. My high score is 4990.
Used @warfame's tutorials on the shoot 'em up game. The colors of the numbers were found in jacknjellify's subscriber specials and the video "X Finds Out His Value" by jacknjellify.