I played through the demo and thought it was pretty good! Probably just the right length to leave me wanting more and hinting at a larger experience.

My only serious complaint would be that the default control scheme had me scratching my head:

1. Keyboard seems to use WASD, which for menu navigation is very unexpected and took me a while to even figure out how to navigate the main menu.

2. I have 2 gamepads plugged in, and it doesn't let me use one of them (a Buffalo USB SNES-like controller). My XBOX controller worked fine.

3. If we assume that the game is mimicking NES or GB, using "fire/B" to CONFIRM and "jump/A" to GO BACK in menus is backwards from how games would usually work.

The other thing I ran into was pausing the game while the boomerang was being thrown and the sound looped forever. Sounds like that might have been fixed in the full game, based on some patch notes.