Man it's a shame that the sound effects didn't quite work because I loved the movement mechanics and speed of this game. You called it a speedrunning platformer and you weren't kidding. It was super satisfying to ground pound enemies and grab the coins/gold, and this felt genuinely fun to play.
Is the score based only on coins collected? I noticed that I get a better score if I go to kill an enemy DESPITE the time loss. That is to say if I get all coins possible but end up with 5 seconds on the clock left the score is still better than getting minimum coins but having 80 seconds left. This doesn't really seem to fit with the spirit of the game as a speedrunning game. Perhaps a time x multiplier would help?
But this was fun!