It's good, but...
After I tried continuing the game later, I wasn't able to buy anymore of the upgrades. All the ones I hadn't bought yet already had the Sold Out sign on them not the other one. And considering it takes a lot of work and time to even gain the money needed to buy the equipment, I am not that eager to replay the game to get where I was before.
Considering this is the first jousting game I've come across, I like the originality of it, but you should have some way to earn more money easier. The difficulty gets higher, but the reward doesn't, which makes is seem unfair. Maybe make the reward increase from opponent to opponent instead of a set reward for each one.