Difficulty is certainly worthy of the title. I thought the three balloon timer room was the last one because of how cruel the timer was, but the game still kept going after, and I ended up quitting at the second cannon room. I wish adding balloons was a seperate button from jump, like "P" to add and "O" to remove. rapidly mashing space bar to barely meet the timer requirements was quite tough. Great visuals, and the balloon mechanic is interesting!