An unfair platformer!! Nice, I love the classics! I’d suggest adding a death counter, and maybe some more visual feedback or effects on the spikes when you die.
The controls feel a bit heavy for a game with such precise collisions and fast events, especially since the game is already pretty challenging.
I got stuck at the double-jump section and couldn’t quite figure out what I was supposed to do next.
Still, really fun entry! Nice job!