Dear Nirag: For your first issue; you have no need to use the up or down arrows, as the only ones used for movement are left and right. For your second issue; Try clicking on the screen of the game, and see if that fixes the Spacebar issue. It has never once failed me. For your last complaint; I believe that was just noodlstudios way of putting a little creativity in his rather linear levels. Instead of thinking about it as a poor game design choice, think of it as a hidden secret! (This applies to the answer selection screen issue especially.)

Sincerely, Dairtheaccomplismnt.

cool game

The concept is good: you force the player to check carefully the surroundings even if the lava flow forces you to be quick.
However, the execution is rather poor: not for the graphics or the gameplay, but because by pressing the up or down arrow keys the whole page scrolls up and down. If you press spacebar, the page goes straight down. The only possible way to jump is to use the shift key.
You should fix that, or at least remove the spacebar from the list of jump keys.
Not to mention that on level 4 you can get on the right edge of the level and travel to the end of the screen, falling out of bounds. And in the answer selection screen, you can jump over all the three answers and fall out of bounds on the right. That's just lazy.

Kinda wish you could just restart a level instead of needing to get it all in one shot. It could also use a slight delay between the end of one level and the start of a second. More than once, I'd finish one level and still be moving, causing me to instantly lose the next level and start over.