Great concept, really like the symbiotic ship/host mechanic which really makes you want to zap those smug looking bacteria. Really nice colour palette and generally good graphics. As others have noted some anims/ particles here and there could really help bring it to life even more, but in 48h this is a solid experience and well put together. The speed of the ship, enemies, bullets, enemy spawn rate etc are well balanced, and the controls are responsive - felt like the ship was going to go where I wanted. I didn't feel much need to move up and down though so perhaps you could encourage the player out of the "end zone" with some powerups further up etc? A complete experience