I'm lovin it!
Well, this game was something new. I always like games where your mouse and keyboard must act at the same time to accomplish something. I'd like it if the character could move with the AWSD keys too, since, well... I'm used to that...
Some other things would be, let's say, health items or a mode where you have to go up while, let's say, lava starts rising, but you can't directly draw under the character 9to prevent them getting really high with only making vertical lines under the character.
Anyways, this is awesome.