Technically I beat the two available stages, although I inserted all my spare coins ;) .
I thought the music got annoying eventually. However I like the look of the game, the visuals reminded me of late 90s sharewares, the nice ones.
The game is fun, controls feel good and you've got plenty of cool boss bullet patterns to deal with.
Cool game, thanks for sharing.
EDIT : I forgot, I did not try it but it was very cool of you to put a multiplayer mode into the game.