The game is indeed very playable now, the fullscreen button adds a lot -- I really liked this one. The progression feels good, the coins and pickup system are pretty juicy (SFX and visuals are both quite good). My only suggestion would be that some kind of pickup magnet upgrade is needed because it is quite frustrating to ride what feels like inches away from parts and not hoover them up; this is especially noticeable when destroying obstacles and visually riding over the parts but not picking them up.
This is a really good little game, I guess it doesn't fit the theme but y'know, for what it is, it's great. Nice work!