First game, congrats. Finishing and shipping one during a jam is a real thing.
Your page description is a model of clarity: the objective in one line, every control listed, then you stop talking. Plenty of much bigger entries in this jam couldn't manage that. Putting High Score right on the main menu is basic done right that a lot of score chasers forgot, and the handwritten font gives it personality immediately. The iris transition on entry is a nice classic touch too.
Where I got stuck: I couldn't really see the game. The canvas doesn't scale with the window, it sits in a small rectangle in the top left corner of a white page, and a big black vignette covers almost the whole play area, leaving just a thin purple strip at the edges. I never found the character or collected a single flower. The pink control legend gets clipped on the right too, for a while I could only read "...N", "...P" and "...NTROL".
If you fix one thing, make it that: scale the canvas to the window and pull the vignette radius back. You clearly know how to talk to a player, the game just needs to fit on the screen. I'd come back and replay after that.