Game showcase - Sandhi Invaders, alpha :)

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Wasn't sure if to create new topic or reply to the list of phaser games, but anyway, I made a typing game called Sandhi Invaders.

Two letters fall from the top and you need to type the correct letter combination to earn a points and progress trough the game. 

Not sure about the details but it is some sort of bypass alphabet for the Sanskrit language which has letters that cannot be typed on regular QWERTY keyboard so you need to type letter combos to guess the correct IAST/Sanskrit letter. Read the help pages in the game to get some idea. 

The game is available here:

http://sandhi-practices.rhcloud.com/

And the answers are available here:

http://sandhi-practices.rhcloud.com/answers/Letters.html

I know its looks plain but I would like it tested and get some feedback if possible.

Thanks.