Hit the space bar to fire, and the number keys buy upgrades. Hit the 1 key while you have 500+ destruction to decrease recharge. Hit the 2 key while you have 2500+ destruction to increase your multiplier, hit the 3 key while you have 100000+ destruction, hit the 4 key while you have 10000000+ destruction to increase your multiplier in a different way, and hit the 5 key once you have 10000000000+ destruction to increase your multiplier in another different way. Also, you can now pay 1000 destruction to unlock movements by pressing the 6 button (You will need it)(It only allows movement up to a certain point). You can also now press the 7 key when you have 2500+ destruction to gain 1 health
