I can see the beauty in it, but I'm not a big fan. Too simple, it's pretty much just holding D and pressing W when you need to get a note. Good graphics, and nice music, so I'd give it a 3.5/5 which rounds to 4/5.
One word: fun. It does have some drawbacks, like no autofire and having to go to the main menu after upgrading, but it's unique and has some nice upgrades. 4/5.
I hate how everyone's saying it sucks because it's random. Well, the rain is random, but that's the one thing that would make this challenging and fun. I mean, if the rain fell in a distinct pattern, it wouldn't be as fun, right? I think that this developer will make good games, hopefully ones that aren't as disliked, and good job on the pixel graphics. 4/5, but only because I couldn't see what level I was on and you didn't use up for jump.
This game is just a copy of Pixelvader. The start of the first levels are the same, the upgrades are the same (except magnet) and the boss of level 2 is nearly identical. I wish there was a 0/5 so I could give it to this game.