Even though the amount for the bid is rather low, I'm pumped when it comes to working in Videogames related stuff, so I'm in.
Relevant Skills and Experience
I've done some Unity related stuff, mostly for the web, I even bought a Udemy course on Unity but haven't have the time to get through it. This might be even doable using plain web technologies.
Proposed Milestones
$25 USD - Project is done
Additional Services Offered
$150 USD - Develop a backend so users can save their progress on server-side, to keep track of their progress.