Neat simple little game, though there wasn't much spinning involved (unless you were spinning the spring, or something?). It was also hard to earn enough coins to buy any upgrades with the RNG I had - a lot of jumps I only had one coin, and multiple jumps I didn't get anything. It would have taken a while to work up to 25 or 50 coins to get the first upgrade.
If you continue tinkering with it, I'd look into some lower upgrade tiers so those first few coins can be put to use somewhere, even if it's just a small upgrade to the spring for initial bounce height. Also, some background music would be nice to go along with the rest of the sound design with the coins. There's a lot of free options for music out there, like freesound . org, so I'd recommend taking a look there and just attributing credit as appropriate for the sound file(s) you pick up.
Nice little game though, and cool to see games made in Pico-8!