Really unique take on pinball that I liked quite a bit! Having to balance trying to keep your dragons in play while also taking the knights out of play is a great risk-reward set-up. It did feel a bit like the outcome was out of my hands at some points but that is pretty inherent in pinball. If there was one suggestion I would make, being able to queue up a purchase would make it a lot easier on the player. I found myself struggling to click a purchase quick enough before a knight pushed me back down below the cost.
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I think letting the player choose is probably the best bet, so for a short timed jam like this one I think you made the right choice. But if you wanted to take it farther, letting the player select a purchase and then essentially having it purchase as soon as the player has enough money, would be a good improvement.