Thank you very much for the feedback!
Its nice to hear that you liked the idea! We planned to add a bonus at the end of the level showing different endings depending on how many coins you got.
And you managed to find the rogue pixel, I realized that while submitting the game but I was too scared to change anything at the last second that could cause the game to crash, the art for the levels was something implemented at the last second because our artist was going trough a lot during development, so I had to design the art for the levels on the last day and as a result, that rogue pixel appeared 😅. We'll fix those problems on the next update!