Do upgrades like "Speed up" or "Power up" disappear once you upgrade that shape? Also, if I accidentally delete a shape, is there no way to get it back?

Rather than a game over, maybe move the food if you lose your piece a bunch of times. It's not a perfect fix, but it keeps you from being softlocked at least.

If you build a vertical wall, it's possible for the "food" to spawn on the other side, softlocking you forever.

Found a softlock bug: I closed the game during their conversation after finishing the tutorial level, since I triggered the alarm and wanted to reset for the bonus. Upon reopening the game, the post-tutorial conversation resumed, but Trilby was back in the first room of the tutorial heist, the door locked, I have no access to the red key software, and nothing does anything. I'll have to delete my save to continue at all, if I can find it.