No review since 2013? Time for a new one :-)
Well, that was a nice rush! Challenging, but not extremely frustrating. A good advice: logic first. At first try to understand how the current level works, what sequence do you need and then just perform the action as fast as you can. Everything is 100% logical.
The game has several flaws though:
1. Many times, especially when you need to pick the mushroom very fast you are failing. It seems that the game requires you to stop for at least a microsecond and then you can do the change and continue;
2. Sometimes it also seems that the game makes you still continue moving despite you have already released the key;
3. Also the hitboxes seem to be very weird, especially of the... mosquitos?
Oh, another advice: don't give up when you have a feeling that you made some time improvement on a level, but the timer is already showing you the same time you have finished the level earlier. Apparently the game is very accurate in time measurement, so actually you may make an improvement of tenths of a second that can really matter if you want to get all the medals.