Hey man! First of all, thanks for the critique!
Yes, the pushing is a bit stupid. We figured that it would be fine for the last level to have a little bit more (artificial) difficulty, but maybe we went overboard.
I'll have to sligtly disagree with you on the coin level and the car speed:
1) the coin level consist of three loops, so just driving along each one once gets you all coins and returns you to the start by default. Granted, a "return to the starting point" would have been nice, but we did add letters around the start that spell out "collect all and return".
2) I think higher top speeds could have been more frustrating, because it is more difficult to correct small mistakes while driving fast. Maybe this is just a difference in preferences.
Kind regards,
Victor