yes, jump maybe possible, but be aware it’s not “jump on” to some cube or platform, cause infact every cube have no top/bottom surface. 
yes, I should say sorry for this, it’s a bug, that sprites with flag “relative to camera” are tookovered too by my render, so they would not be drawn as HUD alike.
Check out new release please (v0.3.3). (to update:In your game, goto JS mode and press refresh button next to the name of my extension in files list at leftside)