Thank you so much for the detailed feedback!
The optimization problem is already solved on the pc version, its just having problems on the browser, might implementing the coin magnet or any other coin picking mechanic seems like a perfect ideia! Thank you!
The full version will has multiple levels, and the option to replay like you are saying (and still giving items, because the difficulty is going to scale faster and if you choose to stay behind you will be rewarded but the game will be harder).
Thank you so much for playing so much and leaving feeback, can I count you in a playtester when I launch the playtest? :)