Overall really fun! I was a little confused at first that I could move up and down, haha.

I noticed that I could skip all the enemies (except the boss).

I think a finished game would be really fun! I'd be interested to know what other powerups you had planned.

I agree with another comment that sound would have added a lot, but I had a good time!

Nice game! I really like your enemies. They have nice animations and like how they react on taking damage. It should be nice seeing how much health they have left. Overall I liked your game :D

Nice graphics, damage flashes, and explosion animations. Good variety of enemies with different patterns of movement and fire.

There really needs to be some visual indication of the player's health. Also, defeated enemies should at least occasionally drop health pickups.

Also, the first boss was very difficult--I could barely get a hit in edgewise.

I did not get any sound. If you didn't implement sound, you should consider it. A little bit of effort goes a long way toward improving immersion.

Cool enemies and a quite hard first boss!!! Unfortunately I got stuck in the boss room after accidentally returning there after beating the boss :)