Thanks for your feedback ! :D
The assets used are free assets found on internet. You can find credits for all of these assets in the game's description on the game page. We just changed colors on some assets and played a lot with the light to make it look like this.
Actually you can go left, but the game use AZERTY input. I think that's the problem. You can change your keys settings before launching the game or at least use directive arrows to move.