Thanks for the feedback FactioneR and glad you liked it! The game was more a challenge for us to get some nice visuals than getting a very original gameplay. To go back to your request, to be honest, the speed goes up only when getting at the end of the level which is pretty difficult to get to for now so we will work on it in the futur.
Anyway thanks for the idea of speedometer, we might use it in the futur!