Very nice game! The colours are well chosen. Here are some things I think could maybe be still improved:
- Incentive: Maybe there could be another incentive than just to survive and get a highscore. Something that motivates the player and keep engaged: awards, stages, changing backgrounds, whatever
- The the bg music is a ted too aggresive for my personal taste.
explosions: Super Mario didn't have any before Super Mario Bros 2, Tetris, Pacman, etc. . But I agree: a good games needs explosions! How could I have forgotten this in my own game!