Thanks to Ms Truffles and Eniko for the work in compiling this list:

Total coins : 388 1-1 : 28 coins 1-2 : 29 coins 1-3 : 24 coins 2-1 : 25 coins 2-2 : 29 coins 2-3 : 17 coins 3-1 : 59 coins 3-2 : 38 coins 3-3 : 11 coins 4-1 : 51 coins 4-2 : 53 coins (including 8 hidden coins) 4-3 : 24 coins

4-2 has 8 hidden coins, here's images showing their locations: https://imgur.com/a/EwMf0n9