itch.io

You can trap yourself inside the ruin if you use the lightning rod to get into the mainroom.

Anyway the game is great please continue working on it I love it. 

Feels like there should be an arcade lobby of sorts where you can switch out instruments you have collected to attempt to make the best beat. 
Bosses also feel quite... almost aggravating...? Especially the first level boss where thanks to their lasers I have a hard time beating them, but yet when I finally do I get... a heart? Wheras the second boss feels much easier with the (creatively designed) swarm paths, and they give me the same reward. 

Also maybe add a market to the lobby where you can trade boss souls as points for a slotted upgrade? It would make progression feel more accomplishing.