It was a fun game with physics inertia and some unfair elements.
I first played and cleared the normal mode, then moved on to challenge mode.
The mode where you treat John-boy had a very hard fixed map with no randomness, but it was really fun.
I was surprised that this kind of rage-style high difficulty game already existed over 8 years ago, before it became a genre.
I had a great time! (=ↀᴥↀ=)