The variety of powerups is great, especially the teleport and slowmo. The generous amount of HP you start with makes the enemies not feel like much of a threat. The large spiky enemy that fires circular patterns of bullets was well designed. An improvement I would suggest is to change the colour of the ship's thruster so that it isn't confused with the bullets, and have the enemies flash a different colour when hit as a visual indicator that they're taking damage. Great work!