Thank you for the kind words!
The bug you found is probably a rare issue combined with lag (the game is actually quite laggy on the later levels since it is made in python and pygame but I added framerate independence to cover that up) and a unique jump case where you just barely touched the edge of the tile. I will fix it after the jam along with other bugs and also add more levels and maybe slope out the difficulty curve. Once again, thank you for playing and for the bug report!