Cool little game that reminds me of DDR. Ahh, the good ol days :)
It took me a few goes to understand what was supposed to happen. Controls or onscreen instructions would have helped a lot in first understanding the game. As others have mentioned, it's really hard to watch the bar during gameplay. I think making it bigger and more contrasting would help? Also, putting which symbol is active somewhere on the screen, like near the meter, would help new player understand which symbol they're trying to hit.
I ended up disregarding the meter completely and just looking for the "odd one out" instead since I realized the game was looking for only one input each time.
There seemed to be a small mismatch with the audio from the button presses? Maybe it's a webgl thing, but if this was intended to be a rhythm game, it felt a bit off the further you go.
Overall, well done and congrats on completing the jam!