Hey! I checked out your game Train Mail. I enjoyed playing it, it was really good! The graphics are really good and the puzzles are enjoyable, using a train to do puzzles is unique.
I had no issues except the movement (where sometimes when you want to reverse, you'd end up going foward, etc), I didn't really like it, but I adjusted. The music also suited with the gameplay. Sadly I didn't finish it as it was kinda hard for me, not really a puzzle person but still enjoy them.
I hope you don't mind I recorded it! :) Good luck to your future games and projects!