Thanks for playing! I'll be adding key bindings in the future. I'm new to game jams so I thought when I uploaded, the key bindings would be shown here from my game's page, but nope.
The window becoming small when the actual game starts is absolutely unintended. I'll fix it, but I'm a bit of a brainlet when it comes to GameMaker resolution settings, aspect ratios, viewports, GUI sizes, room sizes, and cameras. All of those combine to determine the window size and it's a bit complicated.
I'll look into why the purple thing isn't working. As long as you make it to the door/teleporter after grabbing it without dying, it should register as "got". Cheers!