Absolutely loved the aesthetic! I wish the music was more driven by our battle against the notes but for a quickly made game it looks great and feels good and it's adorable but those poor lil' lads gone from home to never return!
If I had suggestions it'd be to have it be more of a rhythm game where our actions impacted the music, spawning lil' lads, destroying notes, missing notes (either them hitting us or us missing them and hitting the end). Mouse control is a bit of a mess, I almost think I'd prefer it'd just follow my mouse and spawn in the nearest lane to where my mouse is but that might mess with the whole vibe that you have going on of it being a cartridge game.