Thank you for the feedback, when the rating period is over, I will try to update my game and add some of the stuff you described, just saying, what [C] mode does is that you can no longer jump on the ground but need to go on a wall to jump, to be able to jump off a wall you need to move towards the wall and hold the left or right key that your already holding plus the up key, like that you will stick to the wall. Then you can let go of the left or right key and it will make you jump up (sometimes you may have to press the opposite key to get it working). It's definitely a complicated concept that I came up with and it would be hard to place it in two or three lines of text. The thing about the bird text is somewhat intentional. If you went into super speed mode you would see that the bird's text and appearance would be multi-colour/chromatic. I don't know, I will still consider it too.
I'm glad that you enjoyed the game.