The game is optimized for HTC 8X, 8S, LUMIA 920 and 820, but he works on older devices with WP7.1 or WP7.5.
It's a 3D game with real time light(specular,mapped) with 2048x2048 texturing, so on older device you can have some lag.
The movie was made on a HTC HD7 this morning(v1.0.4.0), it's a 2 years old phone.
For moment on the Market the version is v1.0.3.0, I improved the character's animation between v1.0.4.0 and v1.0.3.0
I sent V1.0.4.0 to Microsoft this morning, you must to wait 3days before to see this version on the Market.
I am working hard to improve the game every day.
Give me your paypal account, and I will send you $1 to test it.
Best regards
Cedric.