Satisfying gameplay! I really liked your music and SFX choices as well. It would be cool if you could spend money in order to buy money, for shopping time or actual battle time. That way there could be an interesting mechanic where you have to balance the two currencies.
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I actually had some ideas similar to that. One was that any extra time you had when completing a level would be added to a “bonus time” ability where you could use it up to extend your timer. And another was an ability that would increase your timer. But unfortunately I ran out of time to add either of them. I wish I had though, you’re right, I think forcing you to balance the currencies more would’ve been a good addition!