I really want to give this game a higher rating.. but I can't. The difficulty curb shifts drastically by the last few levels, it's enough that it impacts the experience. I 100% get that this is a Game Jam entry with limited time to plan out levels though.
As far as Game Jams are concerned, this is incredible! I wouldn't have known if it weren't for the description. Then again, Game Jams have a tendency to produce hidden gems.
Well done!