Avoid touching pretty much anything. The spaceship follows your mouse. You shoot lasers forward. The bottom right bars are your health. Full Guide: You will have to wait 30 seconds for the boss to appear(the countdown is in the upper right corner). While waiting, every 1-5 seconds an enemy will appear, and chase you. The enemy will take away one of three health bars if it touches, shown in the bottom left corner. You can shoot them with your lasers, and they are one hits, but you can only shoot forwards. The spaceship also follows your mouse. After the Boss appears, with 50 health, they will take randomly 1 of 4 actions(actually, the fourth action only happens when they have 10 or less health, shown in the upper left corner). In between the actions, the Boss will give you time to attack. Enemies will still randomly appear, giving a bit more of a challenge. The actions: #1 The boss summons 5-15 enemies to attack you. They then wait 10 seconds while the enemies attack. The enemies are still one hits. #2 The Boss fires 200-300 missiles in random directions. the missiles slightly change direction while moving, though not necessarily towards you. The missiles are destroyed upon getting hit with a laser, and each take away one health bar upon contact. After creating all of the missiles, the Boss will wait 3 seconds. #3 The Boss rushes at you very quickly. They will point at you, wait a moment, then rush to the spot they were pointing at. When they come into contact with you, you will lose one health bar. This will repeat this 1-5 times. They will then go back o the top of the screen. The Boss does not wait after this action. #4 This one only happens when you get the Boss down to 10 health or lower, and is the only one to happen at said stage. The Boss will move back and forth across the top of the screen, shooting tracking missiles at you. Each missile takes one health bar, and has 2-4 health. Each time they are hit, they are momentarily frozen. The Boss also gains 1 health every five seconds, until their health is greater than 10. If you read to the bottom of this, say "apple pies with eggnog" in the comments.
I felt like pixel art, hence the theme. Tips: While waiting,