Hey Sleepkirby, thanks for sharing your thoughts!
While this is just a demo, there are somethings we've changed since. We've added a buffer for stamina so when its depleted, after a certain time a quarter of it is replenished. So hopefully that helps once its released.
As for the crashing i'm not entirely sure why its doing that for you. On the lameboy itself theres knobs at the bottom right that also changes the colors so I suggest trying those. If you could tell me your OS and some of your specs I might be able to narrow it down, but as of right now I have no idea why it wouldnt be working for you. Thanks for trying the game!