UI buttons as platforms is a great idea! it took me a while to get past the first level with the Start button, but eventually was able to, i couldnt get past the second level Try To Get Through This. is that point where the window resizing comes into play? when stretching horizontally i can see where the checkpoint is, and tried to clip the player through the block by resizing the windows, but i dont think i was doing it right. I tried pushing the block by resizing the window to push the block by the window edge but that didnt work either. Regardless this concept really makes you think outside the box, it got my brain juices flowing! great job!