Cool game, the movement felt way too slow at first but that's what upgrades are for. The sound effects were a little harsh to me but were otherwise good gem noises. The diminishing returns on selling felt like a rip off, would hope to make more money per gem from more gems instead of less. The difficulty curve for upgrades could use some work but it's fine for a game jam.
Good work getting this set up in a little over 3 hours!