Loved the quake hit and minecraft hurt sounds, and item easter eggs. But memes aside:
I haven't played spelunky, so controls seemed hard. The hold X + Y felt hard to pull off, especially when chest opening hitboxes are so small or if you're running and want to throw your weapon. New level spawns next to enemies is evil. It seems that after picking up chests you can't open them anymore.
Chest rewards hooked me to go further. Level generation seemed interesting enough.