Loved the cohesive aesthetics and look of the game, the game start PC interface text prompts set the vibe real well.
It was minimalistic, which isn't a bad thing, but early on I thought I was missing something, some button to press or action to take. Hard to say if the game would benefit from having more actions to make, maybe a system error puzzle event that if you solve it within time limit your painting progresses by x amount of colors or such. This could be a player choice, if they wish to play the idle route they could just ignore the error and it would vanish and the system keeps going normally, but if you wish to be active you could interact with it to boost the progress. This could also be an opportunity to create another upgrade, that influences this error puzzle making it easier to solve and yield more colors. But now I'm just spitballing, you'll know what's best for your game ^^
Do you think you'll keep working on the game? it's impressive for a first game jam project.