I managed to get up to 1,000,000 coins I would stress in the dialogue or tutorial that you need to stop moving if you want passive generation to kick in. That being said the idea of collecting vases to boost income is a fun one :)

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 :)

Controls were a bit too floaty, and the mouse didnt seem to do anything.