Challenging runner game. The brushes that randomly change the level are a good use of the special object, but to be honest only the lava block really matters (and that one can really mess you up).
The coins seem a bit redundant as the score is based on how far you get into the level so they don't add much (unless there is a hidden score if you finish the game of course, I only managed to get to 60% :P)
The music is on point and fits the game well and I like that the "wall" chasing you is actually a giant eraser.
Great job, especially for your first jam !