Mobile menu fix and level 4

This update fixes the menu UI for mobile which before the fix the buttons on mobile would not take input from the mobile touch so the user could not play the game at all.

Next I have added the coins in for level 3 and level 4 with level 4 being mostly finished (the character dialog and shop hasn't been added yet but still the level can be finished)

Finally, this is just an FYI, raycasting is shot from the players foot so when climbing keep that in mind (you can only climb if your feet are touching the climbable wall)