Hi ShibeyFaceGames, thank you very much for trying out the current game and taking such lengths providing me with a feedback as well as an error report! I appreciate the help and feedback you provided so that the game experience can improve for everyone's enjoyment d(>_< ).
Your suggestion for dimming the background during events is a really good suggestion, I will definitely add that into the next update for the game since its would really help players to focus on the events being played during the stage sessions.
I'm glad to hear you like the music in the game, there are more track in the game but locked out until the next few stage updates are up. However you can listen to the entire game OST album at Bandcamp, maintained by our talented music composer. I would also appreciate any support provided to our composer as well (^ω^).
I do apologize for the long tutorial dialogs (^_^;) but I will keep your concern in mind and be sure to streamline it in a future update.
Frankly, your description "The tunneling in particular I used a lot. I found the "wave" attack only useful..." tells me you are using one of the few best strategy for playing the game. Anyway, I am investigating the report you sent for the crash and try to do my best to fix it so that others won't experience the same issue you had.
Thank you very much once again, and I'm really happy to hear that you will look forward to the full game! Please do expect new and exciting content coming out with each major updates along with some game balance/difficulty adjustments for casual mode.