I just want to leave a bit of advice for the judge playing my game. Inside the level builder, it works better if you use the mouse scroll to zoom out when designing your level, you'll see the block chooser at the bottom, and then you can zoom back in to look at what you did from close up. I think based on the ratings I got that my level editor was not intuitive enough and people just used the generator.
If you need a starting point for inspiration you can use the level generator, but when you use the level generator there is no floor so the level is harder to play since it's easier to fall off... if you want to make it easier you should add a floor and have water near lava so if you catch on fire you can put it out.