Nice game!!
I liked a lot the game having a background story. It gave me more immersion to play the game!
Loved the idea to administrate the position where you can put the hole, having to pay attention from where the enemies are comming and if the hole position will catch them.
The grahics are good, I could distinguish well wich enemy they are.
The SFX are nice too. It was ok to play it without music, but having a background music would be nicer.
I just had some difficulties reading what each upgrade does. Perhaps changing the font or the background would help. I think that the yellow bg color with the white font color is difficulting to read.
It's a real cool game and I had a lot of fun with it! I think it would suit well as a mobile game too, because of the touch screen.
Congratulations for the game!!!