Wow, that game is hard! Or maybe it's just I who suck? Anyway, that's a really good work you got here, I loved the music and the effects. Running, rolling and shooting around feels great, but I'd say the enemy projectiles are a bit too fast. Sometimes they would shoot the moment they came on screen, killing you instantly. Maybe if it was more telegraphed, we could react more to what we see?
Good job, though!