Nice concept! There are a few confusing parts, like the 2 min Tax thing, an in-game indicator could really help planning ahead for it, and as others said knowing exactly in game how much each flowers cost and how much they've earned you when you collect would improve this a lot already! Also, maybe reworking how much each gives, because right now at their peak each flower only seems to give 5 more than their cost, so there isnt really a reason to use the most expensive ones, unless I've misunderstood something.
Still, overall a very fun and enjoyable game, and impressive to have done in half the time as well! There's good potential for a super fun game in there, keep it up!