Fun interesting idea but not very deep.
I like the idea and the switched controls are fun and actually make the game better
it could definitely use upgrades and different waves of enemies and maybe a in-game money system.
BTW: There is a way to get the reversed controls without paying for it... you just go to the extras screen, right click, click play and.... well, you just got the new gameplay!
to fix the rightclick problem, just go to file>publish settings>HTML> and turn of the display right click thingy!
hope this helps you more than it does the players!