I like the new tutorials. Though, I didn't notice the HUD information on top until I pressed [F11] to make my web browser go full screen. Doing so revealed more of the game that was covered by the taskbar and web browser UI.
I still feel the bullets are very slow, and the shooting sound effect should always play whenever a bullet gets created. It's a bit awkward holding Left Click to auto-fire and have the sound effect only play some of the times.
I recommend you check out the following talks on YouTube if you haven't already as they do a fantastic job breaking down how to make a game *feel* more gamey and overall more fun. You have a very fun game only a few small tweaks away!
- Game Feel: Why Your Death Animation Sucks
- Jan Willem Nijman - Vlambeer - "The art of screenshake" at INDIGO Classes 2013
- Juice it or lose it - a talk by Martin Jonasson & Petri Purho
And don't be afraid to exaggerate and go overboard! even very tonally-serious games do these things.