I liked the idea - a platformer that quietly suggests you treat it as an idle-game. This also meant you could be quite tongue-in-cheek when saying your own game had 'controls that suck', which was a funny moment. As with jam games, the things I'd want to see done would all involve more time, but the main one was having an end goal visible (say 100 coins) and the idle-coin area being harder to find - maybe through a tricky set of jumps where there are no coins visible so that people don't general go that way. That way you might get more of a sense of 'Ah-hah!' when you realise you can buy the mouse and sword :)
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Thanks for the feedback! Cool idea about harder coins. I ran out of time, but I would like to have animated the blue mouse as an NPC running around collecting coins on your behalf. It would be interesting to switch back and forth between platformer and Idle game. I think your 100 coin goal is a good idea. I was thinking after a certain threshold, that could reveal a door to the next level.