Really nice demo and concept, reminds me of the old NES games. Some feedback if wanted, if not you can ignore it, I feel like maybe letting the player also jump with "space" would be a little bit more intuitive, and adding some tips about the controls would be nice (although I know they are in the description) and maybe try to give more awarness to the powerups because I got one by hitting it by mistake, I thought you couldnt hit them. I really love how the movement and projectiles feel, and the enemies give you challenge but not to much to be frustrating. Wish you the best with the development!