@ryfi Thanks for your perspective, I hadn't thought of it in that way yet. It is true that you don't buy anything with the currency, you just need to have a certain amount at a certain moment in order to progress through the levels. Having the right amount at the right moment is the challenge of the game. The first bonus level is hard, but you can make the jumps (build up some momentum and jump just when you leave the platform). There is also quite some margin for error.
@schizoid2k The button triggers when you enter it's trigger area, when you exit the area the button can be toggled again by entering the area. There should probably be some light on the button indicating when the button is checking for you and when you need to walk away and walk backover the button again.
@samh I created some new bugs in the post-jam version 1.1; but all bugs should now be fixed in version 1.2. The requirements are looser in the post-jam builds; buttons toggle when 80% or more), you can go up fan blowers when 50% or less, you can go down fan blowers when 80% or more. I'll have a look at the exploit for level 6, thanks for letting me know. I was hoping for the theme "side effects", because the current theme is quite similar to the previous one. It also results in a lot of games in which you use health to buy upgrades.