(This week's build can be found here!)
I was somewhat busy this week, so I didn't work as much as I ought to have on the game. I did implement the disappearing walls, and I did make two levels out of them, but that was maybe 45 minutes of work, tops.
The consensus? Walls that don't do anything but block the player just feel... like normal walls. Even if they're sometimes not there. They're not that interesting, and I can hope that when combined with other elements they become more engaging, but I think I'll probably end up scrapping the appears-only-when-charging walls. Walls that appear and disappear on a timer might make more sense...
Charge-up noise by Javier Zumer under this license.