Don't know how many holes there are, yet once the music kicked in and I ended my first loop (I didn't understand the premise till then) I couldn't help but smile at the simple yet creative loop. The options in the shop were great and well balanced for the most part, i.e. just upgrading strokes wouldn't get you too far on its own. The 5+ coin carried the economy, like I was never not going through that lvl2 bunker nor not going for the lvl4 one, but a few of the 1+ coins were well put that it kept the game from feeling stagnant.
My one critic is that moving the mouse a little bit to get the small strokes became very difficult once you upgrade power enough and I know some people do not have that fine hand motor movement to get that, but I only say this because with lvl6 hitting that low became a requirement.
I know I'm saying a lot for a quick Jam game, but I just liked it that much ;)