I beat it and I really enjoyed it! The various enemies were a nice addition, and the spear mechanic blended with everything perfectly. I managed to discover some ways to beat the levels with fewer orbs than normally required. Maybe a feature that's unlocked after you beat the game and shows the number of orbs you used for each level would even increase replayability.
I was stuck at level 6 because when I first tried the proper solution, I was standing too close to the levers. The spear didn't return on time to me, and I just thought that it didn't work and it's not the proper solution, so I started looking for different things I could do.
As for replicating the screen bug, I think you can do it with Ctrl+Plus (+) and Ctrl+Minus (-) if you don't have a mouse. Also, you can make changes during rating period in this particular game jam, especially if it's a bug like this one, as long as you provide the original build for download and list the changes you made in the description.