I want to say the jumping issue is because I might have placed the wrong tiles down or forgot to remove them (even though they are identical to other tiles they have different properties affecting the player). It is possible to gather all the coins - so I feel the lava timing is just right. As for the dashing cool down, you might be right, but I wanted there to be a bit of risk involved when jumping and getting the timing, like for it to come off cool down mid jump!