Standard shooter game, but the controls work really well.

I destroyed those bubbles! Great job!

Nice game.  Are you going to submit an update to this? I ask this because I was getting only one kind of enemy, but the how to play section clearly shows few more enemy types.

Also, can you add some kind of HUD to show remaining lives? I must say that the difficulty curve is perfect for me. I am also working on a similar concept but I have implemented some power-ups too. If you want you can do that too.

Pretty simple and fun game!

think you should add some kind of indicator of what the players health is when they're playing along with adding some sound effects and music would go a long way. but definitely within the theme of the jam.