nice!

but the aiming tends to be inaccurate: I kept shooting way lower than what the crosshair indicated ;'(
also, you should emphathise more the instructions (mostly the ODD or EVEN). and maybe add some challenge or difficulty levels, so that the kids keep entertained.
I really enjoyed the graphics, and the gameplay is pretty intuitive

interesting

its different i like the idea as education but it very "child oreinted" but i suppose that the idea