The game was fun, because there is a way to solve almost every level in an unintended way. I mostly jumped, clicked the box below me, moved it somewhere else then landed on it, and repeat. Again, it was fun tho. Also, dying sometimes doesn't reset the entire level. And, the keys were mostly useless in all of the levels because you got them right towards the end. In the one level where you had to go get the key and then go back to the door, you could just get the key, die, then respawn at the door without having to do the platforming. The fact that you have the key doesn't reset when you die, I think that's a programming error.
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It was intentional to not reset the level when dying - for the cases where you placed the boxes properly, but just messed up the platforming. You can press R to reset the level - perhaps I should have made that more clear in the button prompts.
You're 100% correct about the key mechanic - I realized that it was nearly useless late into development, but it felt too close to deadline to remove it. As far as the cheat goes - well done! I completely spaced that, perhaps a bit more playtesting could have solved that.
Thanks for the super insightful feedback!