Really fun game, loved the pixel art and intro. Would suggest not having the camera move directly with the player jump (either slug it or just don't bother as it doesn't gain anything as you're not needing to see higher on the game screen). Would add health bars to the aliens just so you know how close to death they are and maybe something to show how powerful your gun is - the fact i'm taking time to write this is more to do with how much I enjoyed it so please don't think i'm being critical! Well done!