You must use chrome to play this game.
The medals are working but you must refresh the page to see them unlocked.
It's a free game made with my brother on our free time in 7 Days for the StrayJam organised in April 2017 by Madiber on Itch.game jam.
If the game doesn't work on newgrounds, you can try it here : http://matotitou.itch.io/revenge-of-dog