Oh yes it definitely should not be a rule but it has been our experience in the last 3 jams so it was kind of an unanimous decision on the difficulty level. That being said we are working on future updates and would hopefully release it keeping in some of the difficulty levels in mind.
I think your game could've done with a tutorial or something. I really liked the art style and I was afraid to leave a feedback on your page as I did not want to come across as a noob when I couldn't get past a point lol But I enjoyed your game and especially the quirky sound effects. Again they could've done with a bit more variation. A tip - I usually create a min of 10 sound effects for each action/visual so that they don't get boring. You can have an algorithm to randomise them in your sound manager script.