I really love the artstyle, it's awesome!!
The concept is neat, even if I had a bit of trouble with the controls sometimes: one time I separated my team (using key numbers) to try to reach to that team member I couldn't find and my drum player fell into a green abyss, never to be seen again :') I reloaded the level and kept the team together this time and it went well, I could gather the band and go to the concert place!
At some point I also had a slight visual bug where the guitar I had picked up for a future team member was shown twice (like I had 2 guitars under me). It's not a big deal but I thought you might want to know ^^' I can try to screenshot it if my description wasn't clear!
I loved how the music was getting more full as I recruited more players, but at some point the music loop gets a little bit repetitve, in my opinion... (also I thought it would be cool if when you recruit a new member they did a little solo with their instrument, haha!)
Anyway, regardless of these minor issues I really had fun exploring the place and getting my band ready! I was a bit disapointed there wasn't a concert level or something, I wanted to play more ^^' I would be interested to play a more developed version if you plan to make one after the jam!