Oh man, 88 used to be my worst enemy. Are you killing the strawberries last, after clearing out the bombinos? Since I started doing that, I hardly ever die there (except for the odd case of avoidable clumsiness).
My routine (in case it helps):
- Drop down past the upper right strawberry, all the way to the bottom.
- Eliminate the lower two bombinos with a bomb on the lower right 1x1 square.
- Move to the square directly above that, and attack the other two bombinos. (Bonus: The effect item is within easy reach of a bomb-jump from here.)
- Wait for the ball to go past, then bomb the lower left strawberry from the other side of its wall. If it stops on the ledge below, just chase it down.
- Jump up through the middle of the level. (Jumping continuously by holding the Up arrow is best.) Dodging the ball is easy and practically automatic here.
- Maybe wait at the top and jump over the ball one more time.
- Bomb the upper right strawberry and immediately chase it down. If it lands on the lower ledge, you'll have plenty of time to knock it off before it thaws.
Voilà! One safely cleared level.
I played mirror normal mode and couldn't even succeed in dojo, which usually doesn't even take a life from me... It was like Igor was lagging and suddenly almost teleporting to another location (+ enemies "teleporting" too at the same time...) 
So I am even more happy to have a good computer now.
My game started out perfectly, such that if I had been able to play it straight through I would have almost definitely beaten N-Tuber. (I only died twice before 60, and I got a 
, a 
, and a GMP.) But as it is, I was cut off from my game 3 or 4 times, and every time I came back I would instantly lose 2 or 3 lives because I had lost my sense of focus. Soo annoyingg ...
