thanks for your comments. We have music for the levels, but a not-enough-time-to-fix last minute bug with the background music system caused me to pull it. Being able to 'thrust' downward is also on the list of TODO'.
After the grading period is up, we will have an enhanced version with _so_many_ bugs fixed :-)
If you think that cave is big :-) But, juno will be much more helpful in the next version (right now she will pick up crystals for you, but she will eventually help you with the enemies and she will help you find the last few crystals if you get lost, or miss some!