I saw in your game page you were looking for suggestions, I would probably start by adding some challenge (make some enemies dangerous so the player needs to avoid them or their projectiles). Looks like for now you are relying on a score to hook players, maybe a full-fledged online leaderboard is too much but you can give some reference scores, maybe from the devs, so the player know how well they did or how much they can improve.
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Yeah sadly there were too many smaller things I got stuck on. The idea was to also have a health system so you would have to chose to take a score hit or a health hit from the enemies and then I had plans for abilities and upgrades you could get as the level went on. A leader board would have been a really good idea thanks for the thoughtful feedback!