Thank you for your feedback and for following.
The reason for the mouse controls for jumping is because this game was going to be (and at one point was) on android so touch controls were sort of carried over when designing this browser version. I will look into changing this to the 'W' key as you have suggested soon.
This game has been released as a prototype and therefore I can't guarantee frequent updates, the purpose of having this game in a prototype form is so that I could get an insight to whether development of this game should continue. Although i'm glad that you enjoyed the game, so far the amount of players it receives is not high enough to warrant frequent updates with the most players in a day maxing out at 3 players and on average 1 per day. I am a student and therefore still have to prioritise other projects such as an assessed programming project (which i'm gradually starting to hate as the deadline approaches).
If the game starts to get more interest from players I will definitely return to making major updates but for now its going to have to remain a prototype.
Again thank you for your feedback.