when i jump on the platform by the spikes i can climb the wall and as you can see the ui has disappeared. if you don't fully understand it's probably better if you do it yourself and also it might be better so you can see what i mean by i can't do anything.(sorry sometimes im not really good at explaining things)
Thanks. I understood what was going on. My mistake is that I didn't expect the character to jump above the screen. The browser version of the game does not show errors for the player, but now I have seen the problem for myself. I'll fix it.
Although strange, it seemed to me there is a block for jumping up, but apparently at that time I forgot to put it there.