The art for the game pulled me in and I think that you have a strong idea for a minigame. You had a good implementation of a bit of leeway when it comes to pressing the space bar but I could not figure out the buttons when they said "Hold". I tried holding the spacebar but that would just result in me missing the next input. I'm not sure if you have played Splatoon 2 on the switch but there is a minigame on there that your game reminds me of. This is a link of some gameplay that you may be able to use as reference for your own game.
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I think I played that mini game before! But, If I were to make the game like that! I would potentially focus less on fullscreening the motorcycles response to input and more on display text on every note press/activity from the player’s gameplay!
Still, I think this isn’t the best I can do if I made a rythem game! So do stay tuned if your interested if I ever give the game a fair port as a arcade game in my actual series 👀