WOW. I instantly fell in love with this the moment I opened it. The art, the menu, the UI and the music just took my breath away. I literally sat there vibing away for 5 minutes before I played!
I was a bit confused at first because my initial reaction is to click the menu and it wouldn't work but I worked out I had to press enter. Your page says that jump is space but it's the up arrow key. I found the movement very smooth and easy to get used to. I loved the art the most, animations are really beautiful. I think that the character is a bit too fast from the boss at the top as I could just run away so easily so I had to slow down to be able to admire the beauty of those big boys! The last brain one being my favourite!
Absolute gem of a game, loved it! :D