Clearly inspired from a quite famous indie game for the action part, however mixing it with another famous game for the building part is very clever and interesting !
Right now it's a bit messy though, maybe the player should have a minimap. And have a faster initial speed. With better graphics, background music, etc, i could be much better game. Right now, something is lacking to make the action part entertaining. There is no really interesting challenge right now. I'm sure all of this can be fixed but this start is already very interesting, thanks !
And to the guys saying "good idea, bad implementation" : thank you, you are being very useful.