I appreciate you taking the time to give feedback and happily admit there is still a lot for me to learn - I'm always wanting to build on and improve my skills, and opportunities such as itch.io Jams to get feedback from truly talented people is always a way to inspire to push ahead. Thanks!
As someone who also struggles with getting individual instrument volume levels to line up at times, I'd recommend using a spectrum analyzer to see if anything sticks out (you would look for something like your low-end peaks being way higher than your mid peaks.) Turning all of your instruments down and then turning them all up one by one (starting with the lead and ending with the supporting parts) can also be a good strategy.