Sorry for the controls. I know its annoying if the controls were created for a different keyboard then the one you are using (on german keyboards, e.g. x and z are somewhat weird but I saw them used in games quite often).
We are currently thinking about how to expand the game, we actually put "more monsters" quite to the back of the queue, first wanting to spice actual gameplay up a bit.
Thanks for your kind words and thanks for play :)