I do like it, rhythm games are a tried and true concept, but i think this game could change in a lot of ways. The level building needs some work, when all you have is a metronome as your rhythm and the beats you need to hit are off sync from that it feels weird.
On the topic of the metronome, I think that it definitely needs music, which i know if hard to make yourself in a 3 day jam for most people (me included cause I used something i found free online)
The last thing is that it needs more effects. The flower growing is cool but with a rhythm game what yo really need is something to look at and something to listen to, since your controls will always be very simple
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I agree with all these points. I imagine a polished version of this game would have music, lots of levels, nice visuals. Maybe you collect little trophy plants by completing levels or sets of levels. I dunno haha. Main idea is a fun way to get better at polyrhythm and then keep polishing it until it's an army worthy of mordor.