The game is really cool. I had a lot of fun playing it and the rain looks really cool. The enemy bullets seem to be seriously flawed though. If you remain at the bottom of the level you are pretty much impossible for the enemies to hit as the bullets always go up. Also if there is a pause menu I couldn't figure it out. On the web version, esc just minimizes/closes the window, and 'p' doesn't do anything. Either way, cool game and good luck.
Edit: Saw the standalone version is the recommended version. Esc does pause the game. bullets still have the same issue though.