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How about adding more musical notes. For example, if the player goes further, then you can add not just a note, but some combination of notes in one dice. Or perhaps combine the note cubes into one powerful salvo.
You can also add a laser attack (for the player), some mines, more allies, more rooms and bosses, as well as new game mechanics (only bosses; free mode, etc.)
Waiting for a new assembly! X)
Thank you for attention. (._.)

What should I do if, when downloading a game, it says that the site is not responding? (Game top)